Hi Shivam
I think this is a question for the Community Builder forum. You’ll find their forum at http://www.joomlapolis.com
However, which field is it you’re trying to change?
To add new fields you can use the Field Management tab in the Community Builder component menu (in Joomla!’s administration backend.
If you’re looking to edit some of the existing fields (e.g. Username, email address etc.), I don’t think this is possible unless you edit the mysql database and the php code (which could possibly break your site if you do not know what you’re doing).
For a better solution and answer – you’re better off going to Joomlapolis and see if they can help you out. As they’ve developed the component – they know it inside out and their community members also know quite a lot of indepth information to help you.
Thanks
Anis