Dont worry friend they are easy to setup. The channel are to track specific things such as ad impression,CTR,EPC,many more. Just create a channel and name it - eg.my homepage channel Then while creating a ad in the get ads link to the channel which you have created. Channel helps you to track and check out which of mine AD networks are profitable for me. If you are doubtful then please refer Google Adsense Channel help. https://www.google.com/adsense/support/bin/topic.py?topic=152 Good Luck!