Navigate to the Control Panel > People > Website Modules > Gift Memberships.
Click the Edit icon in the Maintain Column for the gift you want to edit.
If a gift membership has been created but not yet paid for, administrators and coordinators may change the amount, the message, and the recipient information.
If a gift membership has been paid for, only the message and recipient information can be edited.
If a membership has been paid for and used pr redeemed, no information can be changed.