Thanks guys, the advices are usefull. I still want to clerify something:
when I'm trying to send a specific coin the wallet adds the txid and address to the new field. I can remove sime coins (with different txid) but how how can I add new ones? The field with addresses is inactive for adding something.
What do you mean? Can't you add the inputs (and therefore, the addresses) by adding the Coins you want to spent like I said above?
How can I merfe them and will I get charged for it?
You can consolidate several inputs in one by sending your whole balance (and inputs) in one transaction to yourself.
It's something like this:
Input 1 |
Input 2 |
Input 3 -> Output 1
Input 4 |
Input 5 |
Then, when you want to spend your coins, you will have one big input (the output 1 from the scheme above) instead of 5 inputs. Less inputs = lower transaction size = lower fees.
Of course you will be charged for those 5 inputs. That's why some people do that when they are not in a hurry to spend their coins. So they put a low fee to save money and wait more time until the transaction gets confirmed. Then, they will have only 1 output which they can pay with a normal fee when the transaction needs to get confirmed in less time.