From the family's main account, choose Auto Debit Settings under More Options. 

1. Select from the list of options provided > Stop Next Payment; Stop All Payment; Block 18 Days; Block All Reattempt Permanently
2. Provide your reason for choosing that particular option on the white pop up box that appears. Click on Confirm when done. 

3. Go back to the family's Main Page and scroll to the bottom of the screen to the Notes section.  You will see an automated note posted on the ACH stop action you chose. 

Note:  You can unblock an ACH stop 3 business days prior to their due date by following the steps above and choosing the UNBLOCK option.