Never put your key into a transfer field. It is asking for an address for a crypto wallet... which is provided by where you are trying to send it to. The address from there goes into the memo field of the transfer.

The account name should be the person you are sending it to. You should never put your keys into any field when transferring unless you are trying to give someone control of your account.

The address to use is provided by the person/place you send money to. Think of it as a bank routing number.

If you are transferring between accounts on steemit you can put the person you want to send to in the account field and the memo field is used in that case just to tell them a message that you wanted to say. Such as "Here is a tip".