1) Can I ask what you're trying to do with the Edit Ad Page? The page itself should be under your Pages admin area as Place Ad, but the page only contains a shortcode. The actual display gets expanded by AWPCP during runtime. If I knew what you're trying to do, I might be able to guide you better here.
2) What do you mean by "fee term met"? I don't quite understand
3) I'm not sure I understand HTML "sensitize". Are you talking about removing invalid HTML from a classified page? (That's sanitizing HTML) To deactivate that, you need to go under Classifieds->Settings, Ad/Listings settings and check 'Allow HTML in listings?', but in general we don't recommend this as it can lead to spam users posting malware URLs in your ads.