How Do I Participate in A GSA Auction Auction Support October 15, 2018 20:58 Updated Follow Registration is required through GSA. You can register here. To participate you must follow the GSA terms and conditions. Related articles Can the public buy vehicles online? Is there a fee for buying online? Do I have to have Auction Access to Register? What is the fee for purchasing online? I have Auction Access. How can I register online? Comments 0 comments Please sign in to leave a comment.