adding adsense to phpbb 3 forum

do you want to add adsense advertising to your forum.
i could add adsense to the top of my forum by adding the code in the overall_header.htm file, i added it at the end of the file.
the important thing is that when i added it to the file manulay and then uploaded the file it didn't work, i succeded only when i changed the file through the admin system.
same i did with the google analytics code, i added it to the same file, but after the header tag.
if someone could do that after the first post only please write it here.