You can choose for an easy walk with approx 500 HM or a harder with 900 HM.
For the easy one, park your car at the last corner before stade de neige Vauplane(where the GR crosses the road). Walk up to the base of the sommet de la Gourre and when you arrive at there, you are on the crete. Follow it for approx. 3 km to the summit of the Cremon
The hard one goes from the parking Demandolx to the col de Demandolx and from there up to the crete. You will arrive from the other side.