Make sure you understand all the consequences of renting a reservation from a member. They may not allow any cancellation or refunds. You can't just change it at the last minute. You have no control over the reservation until you check in. The member is the only one who can contact Member Services about anything. If you want ME, the member needs to add it. If you want the dining plan, the member needs to add it. If you have a location request, the member needs to add it. Plus, if you have any problems at all, it's between you and the member. Disney will not get involved.