Your best bet is to refer to the software's help manual or support forums. Most likely, there is either an option in the control panel or a file or two you can edit.
I need to edit the header. (I'm using Corporate.)
Just a question. Till I figure out how to add adverts, can I publish the wiki (adless)? Or must I wait till I add them?
You have one week from the day of your account creation to have a working site with ads up (as stated in the TOS). So, if you've had your account for more than a week (which you have), no, you cannot publish the wiki until you have the ads up.
The ads are shown correctly now, so you won't be suspended.
I'll close the thread.
If you want people opinion, please create a topic in the "Teh Intarwebz" board.