Before I have to get 25 LIKE! to be able to using short custom page permalink for vmancer.com. Now it is not necessary. You can get short permalink directly and instant when you register a page. To get short permalink, you need to go to Basic Information if this step is overlooked. If not, you can simply change it when registering a Facebook Page.
Find the form Category and Community Page. This short permalink options can be found below as the name Username. If you require additional information regarding the Username, please be learned on the learn more link.
If you’ve made a username for the Facebook Page, then it will not be replaced. This is the same as making a custom URL for the personal Facebook. So you should be careful before making it, in order not to repeat the process.