To edit a bank or credit card account, follow the steps below:
Go to the External Accounts tab
On the main page that lists your connected accounts, select the arrow to the right of the account you’d like to edit
From there, you’ll be able to change the account nickname, modify the transaction importing rules, and change the auto-tagging options
You'll also be able to remove the bank account or credit card altogether by selecting 'Remove External Account' located at the bottom of the drawer. Once you select the 'Remove External Account' button, you'll be asked if you're sure you want to remove the account, you'll also be given the option to elect the check box 'Delete all imported transactions for this account', if you would like to do so.
See here for more information on removing a bank account that is actively being used for rent collection.