Set Students submit in groups to Yes. This will activate the next two settings
Select an option for Require group to make submission. If enabled (Yes), users who are not members of a group will be unable to make submissions
Select an option for Require all group members submit
This setting controls whether every member of the group must click the submit button, or whether one member can 'submit' on behalf of the group. If set to 'No', when one member of a group submits an assignment it will count as submitted for the whole group. If set to 'Yes' the assignment will not be submitted until every member of the team has clicked the submit button (students in the group will be notified about which students still need to click the submit button). As with individual assignments, if students forget to press the submit button you will still be able to view and mark their assignment in draft mode. We recommend that you lock the submission to prevent changes while you are marking.
Select the Grouping for student groups Choose the grouping you wish to use for the group assignments. Select the grouping that you created when you organised your students into groups