how to curl your hair with a ghd

i've had my ghd for almost 4 years now. and i would like to think i've become pretty good at using it. hell, i can ghd without a mirror nowadays. but there is one thing i have never been able to do with my ghd - and that is curl my hair. so im hoping this tutorial can shed some light on this elusive excercise. good luck ladies! i know im going to need it :)