Time for action – installing Google AdSense
Click on the Modules tab. Install the GAdsense module.
Click on Configure.
Paste the code that you had from AdSense for Content and click on Update settings. If you haven't the AdSense code yet, you can have it from https://www.google.com/adsense.
Wait for half an hour and visit your shop front to see the advert.
What just happened?
Your adverts will start running fairly soon. A quick word of warning, just in case you didn't read Google's terms and conditions. One key thing to remember is that you must never ever click on your own adverts. Google will pick up on this and will not give you many chances before it does something really annoying.