1) Locate the Course Administration block on the right portion of the screen
2) Expand Course Administration and select Users to expand that section. Then select Groups
3) Select Desired Group and Select "Add/Remove Users." Update.
Navigate to the course you want to manage groups in. Click on Course Management in upper left. Then select Groups
3) There are no groups in this course, but more can be added added using the "Create Group" button. Members of the selected group in the left column will show up in the right column. Click the "Add/Remove users" button to do that.