Hi, I have successfully added my Adsense ID in the control panel, but when I try to add a channel I get the following error: "You did not enter the correct format for the Google AdSense Channel ID field. Please read the field description for the expected format." I have tried no spaces, all lower, letters, numbers,.... Thanks in advance!
A channel ID is just numbers. Not a string you choose, but one Google gives you in the AdSense code. There are many threads on this.