From the home screen go to 'Settings' in the bottom right of the screen or click the active bank icon in the top right.

This brings you to 'Bank Connection'

Here, you can 'Link New Bank Account' by following the same steps you did for the first.

In 'Bank Connection' you can then toggle the switches to select which account you want to be active & accepting payments.

You can see which account is active at the top of the home screen - this is also a shortcut you can click to quickly check or change your active account.