Learn how to properly fill out all of the residential listing contract documents and everything associated with it. A OneTime Showing Agreement form is a legally binding agreement between the buyer's broker and the homeowner listing the property for sale.I am a sales agent and am not sure how to fill out the listing agreement form. There is no law that requires a signed buyers agent agreement before a showing. Complies with paragraph 7 of many of the TREC contract forms. It is suggested to ask seller to complete the notice at the time of listing. This is a step-by-step tutorial on how to fill out a buyer representation agreement in Texas. Also, learn how to explain the document in this helpful video! Did you get a Summons to Jury Service in the Mail? If you have received a jury summons you must pre-register below.