It is a little confusing to understand, I quickly took a couple of pictures to help. It's NOT a
cake in the pan just a cloth to show how the plastic/cling wrap goes. Across the cake, enough opening on the sides to allow steam out and not create a vacuum by being air tight. hth.
My daughter just walked in and said Oh how come I didn't smell the cake, and when she realised it's a cloth she says I won't ask what you doing lol.