You need to duly fill-in a Change Request Form (CRF) - that can be downloaded from rsec.co.in or a hardcopy of the same can be obtained from any Reliance Money branch.
Remember to use only BLOCK LETTERS.
You need to submit 4 items:
Change Request Form (CRF) - filled-in
Cancelled check of the new bank account
3 months bank-statement - with self attestation.
PAN Card Copy
Ensure that you have cancelled the check by striking off the check two times.
Ensure that you have the bank account number clearly printed on the bank-statement.
You can courier these items to Reliance Money or you can walk-in to a RelianceMoney branch to submit the same.
Address to Send:
Use the address prited on the CRF Form.
At the time of writing this answer, the address was:
Reliance Securities Limited, 11th floor, R-Tech I T Park, Western Express Highway, Goregoan (E), Mumbai - 400 063, Maharashtra, Tel.: 022-33201212