Requests for determination of insured status, requests for initiation of a claim series in a benefit year, notices of unemployment, certifications for waiting-week credit and claims for benefits shall be made in accordance with such regulations as the Commission may prescribe. Each employer shall post and maintain in places readily accessible to individuals in his service printed statements concerning such regulations or such other matters as the Commission may by regulation prescribe. Each employer shall supply such individuals copies of such printed statements or materials as the Commission may by regulation prescribe. Such statements or materials shall be supplied by the Commission to each employer without cost to him.