How can I create a group, and assign the group to a form?

Step 1: Navigate to the ‘Configuration’ module, then click on the 'Userrights' button.

Step 2: Click on the ‘Groups’ tab.

The following screen will appear:

Step 3: Create a new group, or add members to an already existing group.

For a new group, you click on the ‘New group’ button. 

Adding members to an existing group, you can do by clicking on the ‘Members’ button.

Adding to an existing group:

Step 4: Navigate to the ‘Forms’ module, and click on the 'Details' button next to the form that you want to assign the group to.

The following screen will appear:

Mark the box of the group that you would like to assign the group to.

Click on ‘Close’ after you re-assigned the form to a group. Only the people who are members of this group will see the form.