You can do this with personal pages as well. For fan pages, you must have at least 20 fans before Facebook will allow you to do this.

1) Click http://www.facebook.com/username (or type that in your address bar and hit enter)

2) The first screen will let you change your personal page (you must be logged in). I already changed mine, so now it will show me my other pages by clicking “set a username for your pages”.

Click "Set A Username". You must be an admin of the fan page to do this

3) If you’re an admin of more then one page like I am, simply select your page from the drop down menu. Now add your Keywords. Note: You cannot undo this, so put some thought into it. Consider a keyword domain like:

http://www.facebook.com/napleton.orlando or http://www.facebook.com/used.cars.tampa

You must use periods instaed of dashes. When you done, click "check availability"

Remember, Facebook recently changed it’s privacy settings. Fan Pages will now show up on Google, Yahoo and Bing searches a lot easier. That is why you should consider a keyword domain if you don’t plan on promoting your fanpage with newspaper, radio or TV ads. If you want both, find a happy medium and just make it easy to remember.

It's that simple. Now Click Confirm and You Are Done

Better Tip For A Friendlier Domain Name:

Go to Godaddy.com and buy a domain name for 10 bucks. Once you create it, log in to your domain manager and redirect it to your Facebook Fan Page URL.

Here’s an example: NapletonFans.com This will make it easy for them to get fans when they start their newspaper campaign they are planning.