Just take your time. Backup, backup, backup and you'll be fine :-) Try to find the Porter Plus plugin, just to make sure :-)
FenixAzul said: They are turned on
Try to give more effort than just the short sentences you are producing. Look in the sourcecode, Look at the Url / Internet Address of the page you are at, Look in the controller file for the Url / Internet Address you are at. Look in FireFox / FireBug to see if there are any errors, etc.
First fix the problem, then fix the problem which you would have with category headings, etc.