WAIT~ I'm a step ahead of you............
What they want you to do is line up the inside and outside of the pocket and put them right sides together so that the long sides match up on one end (you'll have a smaller rectangle sitting on top of a larger rectangle.) Sew along the LONG side of the rectangle....then, open it up and fold it together so the right sides are out and you have one big rectangle (the front will have a small border of the inside of the pocket.)
Are you just as confused now?? THEN you can read the other directions I Sent above when you get ready to put the pocket on :)