A channel is a method of filtering content according to a particular subject or campaign that you are interested in. You can navigate to a specific channel at any time using the easy access bar on the left.
Once you click on a channel's name, you are redirected to its dedicated feed. For stats for that specific channel, click on the large 'Statistics' tab at the top of the page.
You will then have access to that channel’s specific leaderboard and stats, including all elements shown in the “Statistics” tab of the “All channels” section.