Threading a sling (text)
Hold the sling with the shoulder seam facing up, one hand on the rings, one on the tail. Make sure the fabric is not twisted.
Pull the fabric through both rings.
Separate the rings and thread the fabric back down between the rings (over the first, through the second).
Organize the fabric across the rings so that it is scrunched but not folded back on itself. If folded it can slowly slip.