Foldedbird, what a fun pattern! I think I'll add that to my pattern pages!
The instructions are just to take one of the 4 rectangles you've made, and fold it in half, so it's wrapped around one side of the plastic part of the flip flop that goes over your foot. Then you just sew it closed, so it's attached and is completely covering and around that plastic part. You do the same with another rectangle, to cover the other side. Then repeat for the other flip flop.
Hope that helps. Thanks for the pattern link!
KnittingHelp Queen Bee
"There is a vitality, a life force, an energy, a quickening that is translated through you into action, and because there is only one of you in all of time, this expression is unique. And if you block it, it will never exist through any other medium and it will be lost. The world will not have it. It is not your business to determine how good it is nor how valuable nor how it compares with other expressions. It is your business to keep it yours clearly and directly, to keep the channel open. You do not even have to believe in yourself or your work. You have to keep yourself open and aware to the urges that motivate you. Keep the channel open."
— Martha Graham