Be careful when using a paper cutter. The blade is sharp, so avoid touching it. Pull the blade all the way down when it is not in use.
To stay safe, adjust the knife so you aren’t dragging it directly towards your body. Also consider wearing polycarbonate safety goggles in case the blade snaps.
If the magnet doesn’t fold or tear easily, the cut may not be deep enough. Go back over it using the knife and straight edge.
You can only use regular magnetic paper from a craft store. Vinyl magnetic material is cut through the same process, but requires an industrial-sized machine.
For example, you can import an image to print using the file option in the upper left corner of the screen.
If your cutting mat loses its stickiness, wash it off and apply an adhesive spray from the craft store.
If you don’t have a cutting machine, you can always cut the design by hand using a paper cutter or knife.