Is your problem that you can't thread the straps through the pedal? I don't have a picture right now (i can take one when i get back), but my pedals (GR-9's) don't accept double straps. What i wound up doing was running the extra double strap under the pedal and securing it with zip ties.

Otherwise, the idea is that, with the pedals flat and the finished part of the straps facing towards the ground, you thread the straps from outside to inside, so that the long parts face the frame. You then wrap the actual strap parts up, through the clips, and then through the buckle. The teeth on the buckle should catch right at the first kink in the picture.