As an example you don't love the default admin URL and you modified the folder name from "admin2344" to "backoffice". The new URL is the combination of your domain identify (or your Shop URL) with "backoffice". When I install prestashop working with Quickinstall (cpanel module) the admin panel url is https://macrobookmarks.com/story21166566/prestashop-embed-youtube-video-fundamentals-explained