With the theme selected you can now look up where you had the option to "customize appearance" and you'll see a new menu which will be for "settings". This is where it gets interesting.

The first part is where you see you're url.

Select the option to...

Use a custom domain name

This sets up a redirect.

Don't use the forward slash or the http. Using the http:// will end up with http://http://yourkeyword.com in which case the backlink isn't going to work.

The format is just

yourpage.com

Scroll to the bottom and "Save Preferences"