This Article will help you Change Nameserver of your domain from your client area.:
->To change Nameserver of your domain browse url http://client.ewebguu.com
->Provide your username and password to login into client area You will See Following Window
->Click on my domains link Now you will see all your registered domain by eWebGuru.com
After seeing carefully you will see 
icon on the right of each domain.
->This is your domain control panel link Click on this link You will find your domain details.
Now find the heading NameServer and change your desired nameserver and click on Save button.
For further reading click here
