Yes. You can change the registrant information of a Domain Name. As per Rediff's policies, keeping the domain name registrant information updated is important to enjoy continued services of your domain.

To change your Registrant information, please follow the below steps:

1. Login to your Rediffmail Pro control panel.
2. Enter your Email ID and password. Click 'Submit'
3. The page after logging in shows the list of all the domain names that you have purchased. Find the domain name for which you wish to change the Registrant information.
4. Click on Manage Domain to go to the Domain Management page.
5. Click on the heading WHOIS Record. Click on Edit.
6. This will show you a form to enter your Registration Information. Enter your updated information.
7. Click on 'Save Changes'.