In Course Navigation, click the People link.
Click the name of the group set.
Expand the group where you want to move the student [1]. Click the student's name and drag it to another group [2].
You can also click the student name Options menu [1] and select the Move To... link [2].
In the Move Student sidebar, click the Place drop-down menu [1]. Select the group where you want to move the student [2].
Click the Move button.
Verify the student has been moved to a different group.