Dry your hair and mist with some heat protector spray.
Separate your hair into sections depending on the size of curls you want - also the wider the irons the larger the curls.
Work in a small amount of modelling wax from the middle to end of each section before straightening.
Use the straighteners as close to your head as poss, place the top of the section in the straighteners and turn them to a 180 degree angle from your head and pull through the hair as smoothly as possible. The slower you do it the tighter the curl and visa versa.
Only do it once and if the curl needs redoing wait until your hair cools a bit first. Use spray to hold and only use your fingers to separate the curls or you'll pull them out.