Ok, hold the sling up by the rings with the label facing in (holding rings from behind). With your other hand, bring the two edges of the fabric together just below the rings, and run your hands down to the ends, so you now have the two corners of the fabric in that hand. It's basically like the sling is folded in half lengthwise. Now, put the hand holding the rings through the rings, grab the two corners of the fabric, letting the rest of the fabric gather, and pull it through. Thread it and pull it through a good ways. Then, find the two sewn edges of the fabric in the tail and pull them away from each other, so the edges of the fabric are at the outer edges of the tail. The fabric edge should come out of the rings on the same spot it went in, not cross over inside the rings. I hope that makes sense!