Instructions for PC users:
To rotate the object - Hold down the left mouse button and drag the mouse.
To zoom in and out - Hold down the right mouse button and drag the mouse.
When the mouse cursor turns into a hand, it means that the object is clickable.

Instructions for Mac users:
To rotate the object - mouse click and drag
To zoom in and out - command key (apple key) + mouse click and drag
To pan - command key (apple key) + option key + mouse click and drag