The viewing window below offers
's interactive features,
in addition to the control panel at the left.
Click and drag with the mouse to rotate the molecule;
use your mouse wheel to zoom the image.
(Perhaps need a pop-up or link to describe mouse features of Jmol window;
there are lots of others that could be quite useful,
such as the mouse-over to see residue/atomic information,
or double-clicking in pairs to measure distances and angles.)
Right-click (Windows) or control-click (Mac) in the Jmol window to open the Jmol menu, which provides access many other options.