Step 1: Click the “Details” step.
Step 2: Click the “RSVP Page" section.
Step 3: Click the “Advanced Options” section.
Step 4: Check the box next to "Top of RSVP message" and type your message in the space provided.
*NOTE* RSVP functionality is only available for invitations. Therefore, Save the Dates, Announcements, and Cards are unable to accept RSVPs.