The top swings back after you press and lift the cover. The fan itself can then be lifted and positioned accordingly. Unfortunately one of the hinges on my sample was broken, but some superglue fixed it in a jiffy. The mount has a red button which controls the two speed settings (and subsequent airflow). There are three advertised (four total) positions. Atop the fan mount are three holes which lock into the clear cover. The possible angles are between 60-80 degrees (approximated).