The two HAOs point in opposite directions to one another, and the two unhybridized 2p AOs point at right angles to the HAOs.
Select the orbitals you wish to display using the checkboxes.
"Click and drag" on the 3D picture of the orbital to rotate it; "Click, shift and drag" to zoom in and out.
The 3D representation can be shifted between solid, translucent and mesh views by using the "Model View" radio group.
You can alter the value of the wavefunction at which the iso-surface is plotted by typing a new number into the "Iso-surface value" box and clicking the "Update" button.