I installed phpmyadmin and get this error:

Cannot load mysql extension. Please check your PHP configuration. - Documentation

I've uncommented mysql extension from php.ini already but didnt work.

Any recomendations?

I see you installed it onto your computer (as the url you have put is the localhost).

Check apache and mysql are running and are up to date.

1. What is your OS?
2. If you do any changes to your php.ini you should restart apache.