The National Association of Realtors, or NAR, reached a landmark legal settlement and in August most of its roughly 1.5 million members will be subject to the new rules. Two main changes are happening now. First, listings in local databases called multiple-listing services will no longer show whether a seller is offering to pay a buyer’s agent, or how much. Second, buyers will be required to sign agreements specifying how much their agents will be paid. Buyers will do this before they start touring homes with agents.