: Locate the last slip knot or loop where the tail was pulled through and pull the yarn back through it to "re-open" that final stitch. Reverse One Stitch at a Time : Find the strand that was passed over the current stitch.
If the working yarn is still attached, you can "tink" (knit backwards) more easily: Removing a Bind Off
: Locate the previous knit stitch (the small "V" shape) just below the bound-off edge. : Locate the last slip knot or loop