The section of file I think you are having problems with is the config.php - I'm using PostNuke asnd the setup is very similar. Either you need to CHMOD this file to 666 so that the set install routine can add your proper details during installation or you need to manually edit this file to the correct values. Something like
$dbhost = "localhost";
$dbuname = "YourDBUserName";
$dbpass = "YouDBPassWord";
$dbname = "YourDBName";
$prefix = "";
$user_prefix = "";
$dbtype = "MySQL";
If you read the file config.php, all the variable have loads of comments. DON'T Post ANY of the above variables info on these or other pages else your site will taken over before you can say "what the...."
Check out the support pages for PHPNuke or PostNuke for more info.
Hope this Helps!
I've started with this stuff a bout 3 weeks ago and it's fairly easy to pick up! Check out
http://www.26point2.co.uk - hosted on HOSTROCKET!
Simon