first you need to fix the database error your site is showing.
you edit the pages where you want the ads to show using a ftp program to download the files and a good text editor to edit them.
now, explaining what type of ads and where you want them to display would help us to help you.
I'm baaaaaccckkkk. still doing work on donation basis. PM your needs.
Premium phpBB 3.2 Styles
If a tree falls in the forest and nobody is there, does it make a sound?