1. Click on Banks 
2. Choose appropriate bank from top drop down
3. Edit account details
4. On the first tab, bank, ensure that in the grid at the bottom of the window has the account set up set to 'define cash account(s)' next to cash receipts system
5. Will need to define how to track cash (one fund, or multiple funds) as well as defining a default cash account
6. Click on the deposits tab 
7. check the box next to cash receipts 
8. Save and close