If your hosting package supports more than one domain, you can add (and remove) additional domains at any time and instantly via the control panel.
Log into the control panel Click the Domains icon Click the Add New iconSelect the relevant registration optionsEnter the domain your wish to add and click the Save buttonIf your hosting package does not support an additional domain, you will need to upgrade to a package that does, or add an additional package to your account.
Log into the control panel Click the Packages icon Click the Add New button Select the package you wish to purchase and enter a "friendly" name for itClick the Save button and the package will be created, however note you will not be able to add a domain to it until you have made payment.