Place the pointed tip on the pyrograver and warm it up, resting it on its support (and watch out for the electric wire in the way!)
Once it's hot, it's ready to use. It's a good idea to do a trial run or two on a wooden board to test the device and, in particular, the way the pyrograver rests on the wood. The point is to mark a line, not to burn the surrounding wood...
With a light hand, simply pass over the pencil lines with the hot tip, never pressing down for longer.