If you no longer wish to have one of your external bank accounts connected to your Nav Business Checking account, you can disconnect it by following these steps:
Log in to your account at www.navchecking.com
On My Profile, select the Personal tab
In the Connected Accounts section, choose the Manage button
Select the account you wish to disconnect and then Continue
Select Disconnect Account and then Continue
Once your account is successfully disconnected, it will no longer show as a connected account