The Custom Name in URL field that you find in the SEO tab of your pages in simply a shortcut to that specific page. For example, if you entered "staff" in the Custom Name in URL field of your staff page, it would appear like this in the address bar: yourdomain.com/staff. Be sure to keep your shortcuts easy to spell and easy to remember. Since they become a part of the URL of the page, shortcuts are not case sensitive - entering them in all lower case is fine.