How Do I Get My Categories On The Subnavbar?

[WAL972]

I tried to edit the code in the Header.php as per the instructions in another post, but when I hit the Update File button, it logged me out and would not allow me to log in. When I logged in again, nothing had been altered so I tried again with the same result.

What am I doing wrong that causes me to get kicked out when I go to edit code via the editor?

How do I get my categories to display correctly, so that when someone scrolls over them, the sub-categories display?

And how do I get my selected categories to display in the Homepage Left, Homepage Right & Homepage Bottom areas?

My URL is BeautyByMariah.com

Your timely assistance is greatly appreciated.

Cheers

Jeff