Step 1: Find the wp-login.php file in the Plesk Dashboard and copy its contents. Go to File > httpdocs > wp-login.php.
Click and copy all the contents.
Step 2: Create a file with the same name that you want to add at the end of your login URL. For example, to access the admin login via the domain.com/viewhere URL, you can create viewhere.php and paste the wp-login.php code into the file.
Step 3: Open the newly created login file and replace all references to wp-login.php with the new .php file name (i.e. viewhere.php).
Step 4: Backup the unaltered wp-login.php. Once the file is downloaded, check the wp-login.php box and click 'Delete' at the top of the page to delete on the server.
Step 5: Access the new login page via the URL you have chosen.