If you haven't encrypted the wallet, just leaving it open is sufficient. Given the value of the coin, I recommend against that, though.
So, here's the procedures I use. Not all of this is necessary, and I'll put an asterisk next to what is necessary.
1. Click on Settings, then click on encrypt wallet. This will give you a box to put in a passcode. Make damn sure you have that passcode backed up somewhere safe. *
2. Click on settings again, then click on Options. From the options menu, click on the "display" tab and check the box to display coin control.
3. go to the receive coins tab and generate a new address. Label it something like "consolidation" (the label is irrelevant, just for your convenience). Copy that label to your clipboard. Go to the "send coins" tab and click on coin control. Click the "list" radio button so you can see all of your blocks. For the first run, click the check box next to all of them. Hit "ok" and close coin control.
4. Copy that new address into the payment line and send all of your coins to it. This gives you the highest chance of staking when the coins mature. (not necessary in your case as you already have them in one block).
5. click on settings, click on unlock wallet. In the window that pops up, make sure it has the "for staking only" checkbox checked, and enter your passphrase. Leave it running and that's all you'll have to do. However, this step will have to be repeated every time you close and open the wallet. *
6. Wait six hours. That's how long it takes to reach maturity. This is a minimum, of course, but that's when your coins become eligible for stake.
I strongly advise against using the method that Biomech has posted, for several reasons:
1. You run a great risk to miss profit share, if you create a new address and send your coins to that (even if that other address is in the same wallet, so you *think* that you still have the coins staking for the profit share, but your registration with profit share required you to register a specific address where your 3 SYNC are located (they can't see if they are staking, they can only verify that you have a balance of 3 SYNC in that address, using the block chain. All the SYNC fund will do is go to the explorer at
http://chainz.cryptoid.info/sync/ and enter the address that you registered with the SYNC fund. I suggest that you all do that for your address and verify the results - it may be that you do not have the 3 SYNC in your registered address if you followed Biomech's advice of creating a new address and sending *all* your SYNC there. In fact, you will likely find that your balance is zero and the SYNC fund will see the same, so you will miss any payouts.
Besides, it is not *necessary* to create a new address, Coin Control is perfectly happy to send from your address to your address if you are so inclined, but I even advise agains that for the following reason:
2. Every time you "touch" your coins by transferring them, even if it is to the same address, you will lose all the rewards that were building up. You will essentially cancel the staking rewards that they accumulated over the hours and days since their last time staking or deposit into your wallet and you start off from zero again. Note that combining coins will not make them stake *more*, they might stake earlier (shortly after the 6 hours are over) but the stake rewards are simply a multiplication of the age and the size of the input, so it does not help to combine inputs. If you have one input of 3 SYNC that would stake every 8 hours, so 3 times per day, the payouts will be *exactly* the same as having 3 inputs of 1 SYNC each that only stake after 24 hours. I have calculated the rewards and the reward is exactly the same whether you have one large block or many small inputs in your wallet.
The wallet also automatically re-combines inputs back into larger blocks once the size hits 0.01 SYNC, so there is nothing you need to do to make staking work "better". The wallet will take care of all of it automatically. Otherwise, if the average age of your inputs is 5 hours when you combine them by hand, the new input will have age zero and you have simply lost 5 hours of rewards.
3. Every time you touch your coins by transferring, there is a good chance that you create "change". There are one or more "inputs" in your wallet that you can see in Coin Control, if you transfer an amount that is not the exact amount of an input, there will be "change" that goes back into your wallet. I have not tried it with the SYNC wallet, but I had to learn with another staking wallet that any "change" is sent to a new address in your wallet and thus becomes not eligible for the profit rewards. The only way to avoid this problem is by going to the Send screen in your wallet, check the box "custom change address" and fill out your wallet address that you registered with the SYNC fund. Now, if there is any "change" it will flow back into the address that you expect. For example, if you have 2 chunks of 2 SYNC in your wallet (4 SYNC total) so you would think that you can withdraw 1 SYNC and still meet the SYNC fund requirement of 3 SYNC? If you do not have the custom change address configured (and it resets every time you start the wallet!) then the result of your 1 SYNC withdrawal is that one of the 2 SYNC chunks is split in 1+1 SYNC, one is sent to the withdrawal address and the other to the "change" address. If no address was configured for change, then most likely the wallet will draw a fresh address from its address pool and deposit the 1 SYNC in that new address. Then, if the Sync fund checks your balance at the registered address, they find 2 SYNC and you do not qualify...
So, I strongly suggest to verify that all your SYNC are at the registered address by checking the explorer yourself and if you want to touch the coins in your wallet for a withdrawal, to make sure that you have the custom change address configured to your registered address or to go in manually, look under Coin Control for any inputs that have a different address and manually send them to your registered address.
Hope this clarifies,
I had to learn all this by messing up in a different PoS coin's wallet and finding these tricks and how-to's.
I might be mistaken in some details as I did not try all this on the SYNC wallet,
so please give feedback and ask questions, instead of finding too late that you can't participate in the profit share.
Success!