I'll try, although perhaps others can do it more concisely. Open it up so that the black handle is pointing up and the other arm extends along the floor in an L shape. You're going to hold the handle and rotate it so the pointy end of the scribe sweeps around in a circle, like drawing with a compass. You're standing in the center of the circle when you do this. The segments of the drawing arm get extended so that you draw the correct size circle. The diameter of the circle should be 3x your height, so you're going to have to do a little math. Multiply your height in inches by 3, then divide by 2 because you're going to need the scribe set for the radius of that circle. When you set the scribe arm to the correct measurement, it can be helpful to mark the position with a permanent marker so that you can set it up quickly the next time. I actually have a marker fastened vertically to the end of my scribe so that it draws a black line instead of just inscribing the circle on the ice. If I'm practicing on freestyle, other skaters are necessarily going to have to keep cutting through my patch and it's easier to see. If I'm practicing on a public session, people tend to stay off my circles if they can see them - although I've noticed other skaters having a good time trying to trace them when I'm finished!