Begin by clicking on the Module you want to make visible to a group, then click on the options ellipsis toward the top right of the page, then "View Release Conditions"

Next, click "Create" 

Next, click on the "Select Condition Type" dropdown, then "Group Enrollment"

Next, click on the "Select Group" dropdown and select the correct group and then click the blue "Create" button

Finally, click on the blue "Save" button