This tutorial will show you how to give your Facebook Fan Page reliable and short address. By default Facebook fan pages have address like this
http://www.facebook.com/pages/you-walked-into-a-room-and-forget-why-you-walked-in/303514397389 This is long address and doesn’t seem so Good. You can alter it and give your page a new short address.
Go to your page for which you want to change the address. Just below your Page’s display picture, click Edit Page [In case if you have upgraded your page, it will appear on right side] Now on the left side panel. click Marketing and then click Create Alias
Now on the next screen, select your page from drop down menu and type your desire username and click Check Availability. If it is Available, confirm that message and Hurray! your page has a new short unique address 😉