When someone tells you to click on something, they mean:
Use your
mouse (or other
pointing device) to move the
cursor until it is positioned on the thing they want you
to click on.
Briefly click and release a mouse button. If there are multiple
buttons on your mouse, and the instructions don't specify
which one, they usually mean the left one. Usually if they want
you to use the right-hand or center button they'll say ``right-click''
or ``middle-click.'' Note: if you are left-handed, you can
set up your pointing device so that the left and right buttons
are reversed. Ask at the
help desk for details.