There are 2 types of RSVPs you can create on MomentVille:
Invite Only - Send your guests an email invitation, and each one of your guests will receive a unique RSVP code in their invite. This allows you to choose who is coming, track whether they have responded, and you or your guest can always update the RSVP at a later date if anything changes.
Public - Put a RSVP form on your site so anyone who comes to the site can RSVP. This is a very informal method of gathering RSVPs.
To get started go to the Invites -> RSVPs tab and follow the instructions to create a new RSVP!
Once you've started, be sure to delete this element or your guests will see it.