1. Open 'Charts of Accounts'
Click on 'Charts of Accounts' under 'Company' tab.
2. Chose Financial Account
Click on the '+' left to the Financial Account of choice, chose the subcategory you would like to modify, click on orange pencil icon left to edit.
Edit/Update Financial Account
Ex: Account Type, Account Name, Bank Name, etc.
By clicking on 'Update' your Financial Account will be updated with the new changes.