If you have a Facebook account, then you would have a Facebook URL which is unique and directs to your profile page. I have seen people, who have created their Facebook account just in fun and now they are using it 24 x 7. For those people, here is the way to change Facebook URL to their profile and the Facebook username.
It hardly takes 2 minutes, you can easily change your username and Facebook URL to something that you want provided its not being used by someone else.
Change Facebook URL And Username
STEP 1: Login to your Facebook account and click on the tab on the top right labelled as Account.
STEP 2: Now, click on Account Settings option.
STEP 3: There, click on the Settings tab and there look for the Username field.
STEP 4: Once you find it, you could spot a change option beside it.
STEP 5: Now, it will ask you for the new Facebook username.
STEP 6: Once you are done with it, click on Check Availability. And if that user name exists, it would ask you confirm the same and then it would show you your new Facebook URL.
These are the steps to be followed in order to change Facebook URL and username.