To rotate the molecule, move the cursor inside the Jmol frame
while holding down the left mouse button.
To enlarge the molecule, move the cursor inside the Jmol frame,
simultaneously shift and left click the mouse then drag the mouse downward;
to reduce molecule size, shift-click and drag the mouse upward...
To access a pop-up menu use the right button on a PC or do a
command-click on a Mac while the cursor is inside the java frame.
To measure a bond distance, double-click on two atoms.
To measure a bond angle, do double-click, single-click, double-click
on three atoms.