A request for determination of insured status, a request for initiation of a claim series in a benefit year, a notice of unemployment, a certification for waiting-week credit, and a claim for benefits must be made pursuant to regulations the department promulgates. An employer must post and maintain in places readily accessible to individuals in his service printed statements concerning regulations or related matters the department prescribes by regulation. An employer must supply those individuals copies of the printed statements or materials the department prescribes by regulation. These statements or materials must be supplied by the department to an employer without cost to the employer.