well ok, but where should i write it this command update..... and so on, how should i run it on the database?
I'm assuming here that you are running the wiki on your own server, not hosted. From command-line (probably xterm if you're on linux or go to windows->run and type cmd if on windows) run the command: mysql --user=your_database_username -p and type in your password when prompted. Type: use wiki; <enter>
Again, I'm assuming that you're running it under MySQL. Depending on how you installed it, you may have to change bits. The username is what you put as $wgDBuser in LocalSettings.php, password is $wgDBpassword and for the "use wiki;" command, change wiki to your $wgDBname if different. If $wgDBprefix is not "", you'll need to change the SQL command to UPDATE prefix_user ... where "prefix_" is as in LocalSettings.php
If you aren't on your own server but on hosted, you should have access to your database, perhaps via phpMySql? Beyond this I can't really help as it's too specific to you.
--Rob
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