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? Do I have to have Auction Access to Register? Is there a fee for buying online? I have Auction Access. How can I register online? What is the fee for purchasing online? Comments 0 comments Please sign in to leave a comment.