You can switch or update the financial account used for making ACH payments on an active loan on the "Loans" page.
1. Select "Loans" from the top right drop down menu
2. Click on the Edit icon next to the loan payment source you want to update
3. Select the new payment source on the newly opened page
Make sure to check off the authorizations and then click on "Agree to Pay" to save your selection
If you need to add an account, you can do so on "Accounts" page. Once the account has been added and verified, it will appear on the page above for you to select as the new payment source.