Hello
In order to access phpmyadmin if you are using Plesk you must follow the steps listed bellow:
You must first login to your control panel via:
https://www.yourdomain.com:8443/and enter your username and password.
You must have already created a database: See our article "How to create a mysql database"
Once the database is created:
1. Click on the "Database" icon in Plesk
2. Choose your database you want to manage
3. Click on the "DB WebAdmin" icon
A popup window will open for phpmyadmin (make sure you do not have a popup blocker installed to prevent this).
You can now edit tables, fields and data as well as perform backups of your mysql database from within phpmyadmin.
and if you are using cpanel then you must follow the steps listed bellow:
1 To access the MySQL Account Maintenance Menu, click on the icon above the words MySQL Databases on the main screen of your cPanel interface.
2 Click on phpMyAdmin
I hope this is helpful
Thanks