Make sure to create a mysql database + that mysql database shall have a user name created and added under it.

How to create database in Plesk Panel

Make sure that newly created database also have database user created and assigned to it

Once done then after you can click on "Databases" option under the same domain hosting ac

You can see phpmyadmin on the databases page under required database to open the same

Please note that if it asks for user password then you need to use the mysql username and password which you have created under that database in steps mentioned above.
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