I did not want to waste a lot of time personalizing our Bill Payment emailed message but wanted it to be worded a bit differently, so this is what I did:

I use Desktop Intuit QuickBooks Enterprise Solutions 23.0

Edit Menu

Preferences

Send Forms

Company Preferences

Used the drop down to get to Bill Payment Stubs

Lower left-hand corner clicked on "Add Template"

Entered my changes, saved

Should show up as Current Default, saved, reopened and my changes were there.

I've used various versions of QuickBooks Desktop programs since 2011.

Hope this helps someone today ☺