Should I use the "Page Alias" field?
Summary: If there is something in the page alias field in page settings, you probably shouldn't change it. This may be used for other links in your site, and changing it could break those links. If there is nothing there, you can add an alias. Aliasing page names helps to identify a specific page in the url field of your browser. While internally, the name of your page might be reflected as /page149.html, adding a page alias will change the name to /pagename.html. If you do add page alas's to your pages, the names must be all lower case without any spaces or special characters. (sample: pagesettingshelp)