On the top of your screen, it says "answers" and to the right of that "groups". Click on that. Scroll down towards the bottom of the screen and there will be a spot saying "create your own group". Click that and follow the directions.
After you do that, join a group called Group Resources Center (GRC) to meet other group owners and find out the tricks of the trade. Also, be forewarned that owning a group is hard work. You'll be busy making new posts, recruiting members and keeping the group active.