I'll make sure you're able to add a new bank account where there are already accounts listed, bchiappa.
Just to make sure we're on the same page, are you referring to the Chart of Accounts page? You can follow these steps to accomplish the process.
Go to the Transactions menu and select Chart of Accounts.
Click the New button in the upper-right corner.
Enter the account name, type, and description.
Hit the Save or Saveandclose button.
If you need help with a different section in QuickBooks, please add a new post below with clarification. This will help me provide specific steps to meet your needs.
Additionally, here are some articles where you can get more tips and details about managing accounts in QBO: