Creating New Group
From the Groups page:
Click on the New Group icon . A pop up form will open, Fill the first page of the form by assigning a Group Name and a Description.
On the second page, you can add members to the group. Type the user name under Add Member to find it then Click on it to add it to the list.
Edit a Group
As for users, you can use the edit icon to modify the group settings or the delete icon to delete the group.