XF 1.5 Adsense within first forum post

Bombardier

Active member
Could you tell me where to put my adsense code to have it display in the first forum post.
Also as a result of my previous PP and Vb site being closed down I get an error message as follows

The requested page could not be found. I would like to place adsense code on that error msesage too.
 
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