Please check the steps that you have to do in your Google Adsense account:
1. Fill the data http://screencast.com/t/3sNonHWBwJ
2. Select the type of display http://screencast.com/t/tmAvL8Yl
3. Add info in the custom channels as described in the help http://screencast.com/t/QtJDoUeHko
4. When fill the gadget, specify the dimensions of this advertising http://screencast.com/t/wBes7bnYnRCs in this wayhttp://screencast.com/t/ExgiXfdBkyo
5. Check the result http://screencast.com/t/Z2bMiXjkMxmI
If you don't have your own website, please follow the steps: https://support.google.com/adwords/answer/2580289
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