Rename your domain :

1) Click Rename Domain on your Home page.

2) Type a new name for a domain in the Domain name field. Leave the www check box selected if you wish to allow users to access your site by a common URL like www.your-domain.com.

Having the www alias preceding your domain name will not cost you anything, but it will allow users to get to your site no matter what they type in their browsers: www.your-domain.com and your-domain.com will both point to your site.

3) Click OK. The operation might take several minutes, during which all domain services will be stopped.

Since domain renaming involves modifying DNS records, allow up to 48 hours for DNS propagation after the renaming.