Okay, thanks for reply at first. I just supposed it might have been that problem but I guess the reason is elsewhere then
With that control panel v3 I don't see anything wrong with ports (Although during installation it did mention that).
Thus I ignored the error message I get when trying to open phpMyAdmin is like this: "PhpMyAdmin tried to connect MySQL server but server denied connection. Check the server name, username and password from config.inc.php and check they match with data given by MySQL-server administrator." (translated it so might include errors).
Didn't find that config.inc.php anyway...