How do I make a deposit directly from the blockchain?

[raleatherbury]

I tried to send crypto from Coinbase to a theta wallet, but as a newbie (or some other dumb reason) I forgot to use an exchange...and the crypto never made it to the theta wallet.

This/my crypto is on the blockchain attached to the wallet address.

I've heard there's a way to make a deposit directly from the blockchain into one of my accounts (Coinbase, MEW, etc).

Can someone tell me (hopefully in layman's terms) how to do that?

Thank you!

[nc50lc]

You can access it via MEW but make sure to do all the necessary safety precautions on using a browser-based wallet.

In Theta wallet, get your ".keystore" file from the settings; if you already have it, directly go to the "old version" of MEW.
For some reason, the new version is throwing error at my end.

The old version has a link above the main page next to the text: "Missing the old version".
To open it, click "Access My Wallet", then "Software" next is "Keystore File", continue.
Browse to your .keystore file's directory and open it, type the password and you should have access to your wallet via MEW.

I've heard there's a way to make a deposit directly from the blockchain into one of my accounts (Coinbase, MEW, etc).

Can someone tell me (hopefully in layman's terms) how to do that?

The steps above is not actually "deposit", you'll just transfer your key to another wallet so it can access the address instead of the previous wallet.
Since the previous wallet doesn't support the token/ETH that you've sent to it, it didn't displayed any balance but in reality it's sent to the address
but the only way to access it is to restore the "key" to a wallet that supports it.
That wont work in custodial wallets and exchanges like Coinbase though so be careful next time.

[joniboini]

I've heard there's a way to make a deposit directly from the blockchain into one of my accounts (Coinbase, MEW, etc).

Not sure what do you mean by that. In general, you access your assets via a wallet. An exchange does this for you, so even if you don't use an exchange you can do the same thing with a wallet just like mentioned above. How did you send it in the first place? From where to where? Coinbase to your personal wallet?

If you successfully created a transaction on Coinbase then the transfer should succeed.

[NotATether]

What are the source and destination currencies?
Do you have the address on the blockchain where you sent the source currency to in your wallet?
Perhaps you were transferring e.g. Ethereum to a token's wallet and the ETH is stuck on the address of the token's wallet but on the Ethereum blockchain.

I don't know if Theta wallet (is that a wallet name, or a token by the way?  ) gives you access to the private key (string, file, or otherwise), but if it does, you can theoretically import it into the ethereum wallet and then send it to a different address but as the destination cryptocurrency instead of ETH.

Again, all this is difficult to explain without knowing what the source and destination cryptos are.