If the customer wants to change the bank account that is linked with their Zerodha account. The customer needs to submit the 'Account Modification Form' with a bank proof document. The steps to change the Zerodha bank account are: 1. Visit the Zerodha website 2. Move to the 'Download & Resources' section. 3. Download the 'Account Modification Form' 4. Fill the form, sign it and get a print out. 5. Attach the bank proof documents like bank statements, cancelled cheque etc., along with the form and send it to the Zerodha Bengaluru office.