I am new to this concept.

I have one master database. and 2 or more client databases.

In master database, it has all the clients database username and password,

Structure of the all client databases are same.

Consider My Master Database is alpha,

I have 2 client database , 1. Beta , 2 Comma, respectively.

If I want to access the client database, how to do? it is not cloud database. it is in PHPmyadmin

Connect with and login to master, get the userids and passwords for beta and gamma (comma?), then connect with and login separately to each client database.