With any of those types of forms, @LindaH-FL , I have developed the same process you’ve identified.
Write nothing on the form if they Decline the “offer.”
Give them a note pad to briefly explain the reason for their decision.
They initial their note/reason.
Whether it’s a ‘sticky’ note (or not), I staple it to the document (to ensure it’s secured in-place).
Unfortunately, paper-clipped and/or sticky notes can become dislodged & create an “error” or “defect” or confusion . . .
P.S. As Arichter mentioned, do look for the “Check Box” option for Decline. If the signers check that box, they’ll need to execute the document.