Using a canned app, eh? Serves you right (but only because you're not learning anything about the apps).
Okay, phpmyadmin has a particular quirk in that it's configuration file, config.inc.php, is buried in the config subdirectory and MUST be properly setup for phpmyadmin to function properly. This is a SECURITY measure which should not be taken lightly. Get into that directory, configure your phpmyadmin settings correctly and you'll be away with a great tool.
THEN, get a copy of Kevin Yank's book and learn to setup your daemons yourself (so you can actually mirror what your host is providing and update individual apps on your schedule, not XAMPP's schedule). Further, because I do NOT use canned apps like that, I am willing to believe that they do not provide upgrade paths, only a fresh install every time you need an upgrade - how ugly is that?
As the former TL for Hosting, I've got to thank you for admonishing 999 for the lack of useful information. It's really nice for me not to be the gorilla in the board! You should see my Standard Rants (automated responses to common nonsense) with AutoHotKey!