To view your channels, go to your profile. Your profile, select the CHANNELS button above your images.
At the top of the channels page you will see your personal channels. Scroll down to to see the channels of your groups, organized by channel. The image you see on this page is the first image in your channel. If the channel appears grey, the channel is most likely empty.
Click on the channel to see all the images posted in it. On the next page you will see every image. Click on any image to open it in full. To view all images as an interactive slideshow click the button on the right that says view as slideshow. You can also rename and delete the channel on the right.