Yes new topic would be better..any further unrelated questions, please ask in the relevant forum.
But as you've already asked it...
Go to Banking and General Ledger -> Bank Accounts, you can add as many account as you require and define your 'default' account.
FA takes a little time to learn, you will need to read - to learn how to use the program and get the best out of the program. This investment in time will be repaid when you see how much time FA can actually save you
Clicking help in the top right corner of any page of the program will take you to the relevant wiki page.
The wiki contains most of the info you will need to know, most of the rest you can find in this forum.