Kiwi shoe polish comes with a lever-style opener on the side. It works by pushing up on the lid and breaking the seal, making it easier for the top to come off.  If the lever on the side of the can breaks for some reason, you can use a butter knife, flathead screwdriver, or another flat, metal object that fits under the seam of the lid. Chances are, you'll see a divot in the lid where the opener originally sat. You'll want to put the screwdriver or other object in this divot and use it to pry the lid open. Try to avoid bending the lid as you pry it, since this creates further damage that will make it harder to remove the lid in the future.