If you mess up a center panel so that you can't get to the "log in" panel often located to the right, just type in www.your_site.com/login.php
(where your_site.com is your sites address of course).
After you log in - use www.your_site.com/login.php to gain access to the admin-panel and fix whatever panel that mess up.
If you're unable to access your site trough login.php - use phpMyAdmin to disable the troublesome panel. phpMyAdmin is the tool most webhost provide you with to manage your database.
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