Should you want to remove you connected bank account completely from TAXO'D, here's how you do it.
Choose control panel form the home screen
Hit Power-ups > BankSync
Hit the cog in the the top-right corner
And choose 'Yes' to manage bank accounts

You are presented with two options:
1. Remove bank account and data
Deletes bank account and all records associated with this account
2. Keep data and remove bank account
Deletes bank account and keep all data associated with this account
Deleting your bank account
How to delete your bank account,
what happens to your data once you delete
Splitting the bill