Your page URL or website address is also known as your username. It’s the exact address that someone can type in to get to your page; for example, . You can change this address one time only.
When you first create your page, you’ll have a very long, unwieldy URL. By changing it to a shorter name, you can more easily direct people to your Facebook page.
To change your URL one time, go to username. Make sure you’re setting your page website address and not accidentally setting your personal website address.
Note that you can capitalize words in the address, but capitalization isn’t a factor in getting to the page. Someone can type in lowercase or uppercase letters. Also, the address can contain only alphanumeric characters–no spaces. And you must be an admin of a page to set the username.
If you’ve changed your username one time and aren’t able to change it again, you have to go through Facebook’s Help process to change it. And then it would probably need to be a company branding change.