After your Facebook Challenge has finished, you may want to close the form so it doesn't receive any further submissions.
To close a form:
Head to ''Campaigns'' in the main navigation bar at the top of your account.
Select ''Forms'' from the drop-down.
Find the form you want to close and click on the little pencil icon on the right-hand side.
Scroll down to the bottom of the form and tick the option ''Close this registration form'' option in the form itself.
This prevents the form from being accessed, which allows you to stop sign-ups to campaigns that have already ended.