Section 12(3) in The Post Office Savings Bank General Rules, 1981
(3)A nomination made under sub-rule (1) may be cancelled or varied by the depositor of the single account or by the depositors or the surviving depositor or depositors of a joint account, by submitting an application in Form-2, affixing postage stamps of the value of one rupee to it, together with the passbook to the Post Office Savings Bank where the account stands or to the relevant Head Savings Bank.
