You can follow the steps listed below to get a new domain added to your site through the Dashboard.
Click the Main Menu button in the top-left corner of the screen.
Click Settings in the Main Menu.
Click Domains in the Settings Sub-Menu.
Click Add in the Domain Settings panel.
Type the name of your domain and click ‘Add’ when finished.
Note the on screen options to designate the domain as Primary or for Development, if this is the first or only domain for your site we suggest checking the primary option.