I use the "other" tip. I put a glass pane from a picture frame I wasn't using on top of my self-healing cutting mat with grid lines printed on it. I measure my ribbon with the marks on the cutting mat, and just "freehand" cut the ribbon with the wood burner. Cuts like a knife through butter. If you move too slowly, the ribbon gets bumpy/burnt marks, and if you move too quickly, or try before the burner heats up enough, it won't cut all the way through. A little practice is all it took for me, and I just used scrap ribbon until I figured it out.
Hope that helps!