A claimant must notify us in writing (e.g., Form SSA-1696 or "equivalent writing")
            if he or she appoints an individual to represent him or her in dealings with us. A
            claimant must also let us know in writing when he or she wants to revoke a representative's
            appointment. Likewise, an appointed representative must notify us in writing when
            he or she wants to withdraw from an appointment. Claimants and representatives have
            these options to use our forms for their actions.