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Put on your safety gear. Use your glass cutter to create a score line. Apply pressure to the glass to break, or "run", the score. Cut your glass into whatever shapes you want to fuse.
Make sure you're wearing your gloves, goggles, and mask before you start cutting your glass. This will prevent avoidable injuries like cuts and stop pieces of glass from getting into your eyes. Once you know where you want to cut on your piece of glass, roll your glass cutter across the surface of the glass, creating a score line where you want the glass to break apart. Finding the right amount of pressure to use with your glass cutter might take a few tries. Too little pressure will cause the glass to break unevenly, while too much pressure will create chipped edges. Do a couple practice cuts on a spare piece of glass until you get a feel for the tool. You can use pliers or your hands to apply the pressure to both sides of the score line. The glass should break in a clean line along the line you scored. Use the same method whether it's a curved or straight line you're running. Cut circles, squares, triangles, or whatever shapes you want to use in your design. Remember that you can stack your glass pieces and fuse them directly on the kiln shelf, or you can lay them over a slumping mold to create a three-dimensional piece.