1) First, you take the sarashi for its ends and press/fold it in a half about 20cm long.Take the corner of the first part of the cloth where you are going to start wrapping.
(your torso, if you are a woman, or around your stomach, if you are a man) Since the width of sarashi is large, that way, it is easier to wrap it.
2) Wrap it for several times, at least 2-3. Tighten well, to prevent Sarashi from loosening.
3) You repeat the same moves, until you have wrapped it whole.
It’s on your back at the end, you should twist it.
4) In the end, the edge(s) of the fabric are put under/beneath/into the wrapped sarashi.