XF 1.1 Best way to add adsense?

#1
Wasn't sure where to post this. What is the best way to place adsense throughout xenforo? I wasn't able to find any free mods, I don't make enough of my site to justify purchasing one.

I can add it to the main index, but thought there might be a way to include it into a new thread in the first post somehow as well.
 
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