How to stop phpMyAdmin login page being accessed from inter

[aj123cd]

How to stop phpMyAdmin login page from being accessed from internet

PhpMyAdmin can be accessed simply by
http://www.mydomain.org/phpmyadmin
when type this URL, phpMyAdmin ask me for a user/password and if OK it grant the full access to the database.
Do you think that this is a secure way to manage phpMyAdmin?
Can I do more?