http://www.facebook.com/home.php?#!/?ref=home
Now Facebook allow you to change your page name to something which include your business and brand name .
1. You need to have 25 Fans or more before you can create a custom URL.
2. Also once you create this custom URL you can not change it.
Note : You need a mobile phone as facebook requires verification via text.
anyways if you meet these requirements then simply go to the following address:
http://www.facebook.com/username/
And follow the instructions given .
