Hello

I really urgentally need some help here guys. I have a horizontal google ad code i need to put on my site (on the wakaba.html page). But everytime i do it and i post somethign the ad disapears. can someone tell me where to put my google ad code so i can have it either on top of the post form or below it without the ad being removed everytime someone makes a new post? let me know, thanks guys.

(if someone can give me a psecific file and place to add it that would be very sweet).