in order to access phpMyAdmin without login into cPanel and just access directly with any specific domain, you need to install phpMyAdmin on the Hosting File manager.
it will create you a link to access phpmyadmin directly from your domain
e.g. https://domain.com/PhpMyAdmin
in order to install phpMyAdmin on specific domain, follow the steps below
1. Download the latest stable version of the PhpMyAdmin software
https://www.phpmyadmin.net/downloads/
2. Upload the File into FIle Manager hosting under Public_HTML
2: then Extract the archive file under the File Manager Public_HTML directory
3. Rename the extracted phpMyAdmin-XXX-XXX folder to PhpMyAdmin so that your URL will look something like this: https://domain.com/PhpMyAdmin
You should now be able to access phpMyAdmin directly from your domain.
5: you can try acces https://domain.com/PhpMyAdmin in your web browser. (Replace domain.com with your actual domain name.) You will be prompted to enter your cPanel user name and password.
Once you have entered your credentials, it should take you straight to phpMyAdmin interface