Website help

Guys

I made a forum using forumotion.com

But as am in an arabic country so the website is

http://ift.tt/1gYMc3t

I want to change "forumarabia.com" to ".tk" how can I do that?

NOTE for whoever admin or mod checks this topic

This is the website of "me and my bro server" so if u saw the same website anywhere else in the forum dont ban