To find your group code, click on the corresponding group on the "Groups" tab. On the group panel, click on "Edit" on the top right corner.

On the following window, you will find the group code on the left part of the screen. If you hadn't activated it when you created the group, you can do it now by clicking the switch. Remember to click on "Save" after activating the switch so that the group code is available for the students.