Umesh,
You can do this thru several avenues...first did you register the domain name? I have seen often when you have a third party register the name they do not list the business owner/administrative contact as the client.
You can check you domain information thru most domain registrars such as Network Solutions (www.netsol.com) or GoDaddy (www.godaddy.com) type in your domain name and then follow the links to review the domain owner information. This should display the company that owns the domain name the three primary contacts (Administrative, Technical and Billing). As well it will display the expiration date.
You can renew or extend your domain ownership thru any of the online registrars. I have used both NetSol and GoDaddy and both are excellent organizations to work with.
If your not sure or need any help feel free to contact me I can research and give you directions on what you need to do. I will simply need to know your domain name.
Todd Jennings
CEO/Founder
Panthera Technologies
www.pantheratech.com