You can add them by going to your WP admin panel, than Presentation and than Theme Editor. Select the page of template you wish to edit (Header probably, since you're using Corporate plan) and paste the ads code.
Are you sure about that? One of your last posts was about where in Fantastico you could find the free version of IPB 1.3.1, and now you seem to have purchased a $185 IPB License, $275 IPB Copyright Output Removal License, $65 Invision Gallery License, and a $50 Invision Blog License. Please provide your IPSBeyond username to confirm that you are an IPS customer. It seems odd that you would be wanting something for free so badly, and then suddenly pay $575.
what? I didn't purchased all this. I have it for free courtesy of my relations with Mr. Josh at Invision. Now I can't tell you everything about him. I just asked that how can I place the ads. Why I tell u my username at IPSBeyond?