Learn how to properly fill out all of the residential listing contract documents and everything associated with it. A Commission Agreement for Sale is used for one-time showings of real estate so a Realtor can show a home to a prospective buyer and be paid a commission.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! There is no law that requires a signed buyers agent agreement before a showing. I am a sales agent and am not sure how to fill out the listing agreement form. Here you are listing the legal names of the two parties in the contract (the buyer and the seller. Ask seller to complete the notice at the time of listing. PSA TO ALL HOME BUYERS: On August 17th a Realtor CAN NOT show you a home unless you have signed agreement with them. Also, the space on the form is only two and a half lines long which is insufficient for any serious amount of text.