How to use Nexstar 114 GT? PLEASE HELP!

Hi:

I just bought the Nexstar 114 GT and wonder how I can use it to view
the Polar Cap on Mars. I tried to use the 10mm eyepiece and can only
see Mars as a white source of light that is about the size of the a
pencil top. Can someone provide me some instructions on how to set it
up? Now I can use it to see the surface of moon; However, the
instruction said I should see Jupiter or even the Saturn ring with
this scope. So I guess seeing the Polar Cap with this sope should
have no problem. Am I doing something wrong? Thanks very much for
your help as this is my first time in life to use a telescope.
Thanks.

Novice