You don't have to manually put in your adsense code individually on every hub you make. All you need to do is go to your affilate settings and put it there once and for all. It is a little bit tricky setting up your adsense code.
Click on the signup for adsense botton, you will be promted to answer whether you already have an adsense account or not. If you already have, simply click on yes and put in your email address and the last 5 digits of your phone number.