Nomination cancellation and variation: procedure for substituting nominees and appointing guardian for minor nominee under savings certificates. Form-3 requires holders to apply to the Postmaster to cancel or vary a nomination under Section 6 by submitting the original certificates and specifying the earlier nomination details, new nominee(s) with addresses and birthdates for minors, and appointing a person to receive sums if a nominee is a minor; the form also captures certificate particulars, holder's signature or thumb impression, witness details for illiterate holders, and Postmaster acceptance by date, stamp and signature.