Hi I have accidemtly added the same bank account twice. How do I delete one ?

I can help you delete your bank account in a few easy steps, @warner_cube.

You can delete the bank from the Banking tab. Here’s how:

1. Go to your Banking tab from the left menu.
2. Choose the Bank Account you want to delete and click the pencil icon on the top right of the account. 
3. Select Edit Account Info and hit the Disconnect this Account on save box. 
4. Select Save and Close.

Check this article for more information: How do I delete my Bank Account?.

I'm always here if you need further assistance in deleting the bank by leaving a comment below. Take care and have a wonderful week!