Step 1: Login to cPanel
Step 2: Select File Manager under the section File
Step 3: Locate the existing admin directory your Prestashop installation.
Step 4: Rename the current admin folder (For example admindemo) name to the new folder name that you wish to set.
Step 5: Now access the new admin folder URL via browser ‘http://www.yoursite.com/admindemo’, it will display the Prestashop admin dashboard login page.
Step 6: Normally. Prestshop don’t allow standard admin URL that is ‘http://www.yoursite.com/admin’ for security reasons. So, you would need to set the different URL rather than the standard one.