antenna log-spiral at HFSS

i had tried hfss v10 to design logarithmic spiral antenna, but when i opened hfss design,
in menu items Draw > Spiral cannot be opened. so i didn't know how to design it again.
can somebody help me to give me steps to design spiral in hfss?
do you have tutorials about design of log-spiral using hfss?
my email is abdhaw(at)yahoo.com