How to add new field say "Phone Number" in MemberRequest Webpart?

I would like to add certain fields in the webpart like few String fields and couple of dropdown fields, Kindly tell me how can I do this.

Thanks,
Kamran 

You can edit the web part templates under Layouts\FBA\Webparts to add the new fields.  However to save the information typed into those new fields, you will have to modify the web part code: membershiprequest.cs and membershiprequestcontrol.cs.