You have two options:
1. Head to the banking tab and select the account you'd like to remove.
2. Click the edit button, and go to "Edit account info."
3. Check the box next to "Disconnect this account on save."
4. Save and Close.
Alternatively, you may follow these steps:
1. Go to Accounting --> Chart of Accounts.
2. On the right side of the line for the account in question, click the down arrow next to "View register."
3. Check "Make inactive."
4. Click Yes.
