Follow the instruction below tp create a Facebook page vanity URL.
- Login to your Facebook account where the page was setup. i.e. you may have setup the page through your personal account, in that case login to your account.
- Visit https://www.facebook.com/username.
- Choose the username for your vanity URL.
- Click availability. If not available type another username. Make sure this is goning to be your permanent page URL, you won't be able to change this.
For instructions on how to edit a URL once click here.