Step 10: Pin The Border
When you come to the corner pin your border in place about three inches up on the side you will be pinning next.
Lift the border on the left side and using your finger push the bottom border piece underneath then push the side border piece on top and pin. Continue all the way around until you come to your starting point on the bottom edge.
When you reach the starting point cut away the excess border three inches past the starting point. Fold the excess back so the top just meets the starting point. Finish pinning in place.