pack a normal sized bowl of weed, best if weed is ground and lightly packed. Then carefully melt the wax/hash onto the top of the bowl. Make sure not to use the direct flame on the hash until you are ready to smoke.
lastly, and perhaps most importantly... NO PACKING THE BOWL!!!! I quit topping bowls because everyone, I mean fucking everyone has a habit to pack the bowl with the bottom of the lighter right before they hit it. When you try this with wax on top you pull the wax right out lol.