Here is what I think it says. But I think Im close but definetly not right

12 in piece by 60 inches for a 18 to 19 inch bed ( i assume this is the round top part of the bed.

Then cut 2 squares and round them? (this would be the part they sleep on?)

fold the 12x60 in peice long wise and pin.

Put one round piece down, right side up, and pin the strip all the way around, I assume this means the round top part of the bed to the part they sleep in?

but leave enough to fold in a little to make a little hem then pin one end inside the other just a little. (HUH)?

then I assume you sew on the second circle , when you are doing this the round top part should all be inside? Is this right?

I think I get it, ugh Im not sure, but the more I read it and say it, i think i get it