This is done through the Auto Bank Rec Template:
From the main menu go to Auto Bank Rec Template.
Check if you already have a template if you don't a new one will need to be created.
If you do then you can select COPY.
After you have added the details of the bank account and sort code click SAVE.
Note: If a new template needs setting up please raise a new case online and reference the title of this article, accounts support can then send through the details of how to do this.