1. Login to APC and select Form Setup.
  2. Double click the form you use to print your checks.
  3. Click the Design Button in the Update Form Dialog box that pops up.
  4. This brings up the design of your check.
  5. Find the Routing Number or Accounts Number text box that needs to be changed and right-click on it.
  6. Select Properties.
  7. You can change the number in the text box.