How can I edit a Group Profile Page?

A group profile works the same way as a normal profile.

It shows all the channels that the group owns, plus channels where the group is a collaborator. Private group channels are only visible to group members and other collaborators.

Group admins can also add an avatar image to the top of their profile. The name of the group admin (the person who created the group) also appears in the description field of the group profile.