If the working yarn is still attached, you can "tink" (knit backwards) more easily:
: Insert your left needle from front to back into that "V" stitch.
If you have already finished the piece and woven in the ends:
Gently pull the working yarn to "pop" the bind-off stitch out, then place the newly freed live stitch back onto your left needle.
Insert your needle into the loop below the one currently being held.
: Continue this process across the row until all stitches are back on your needle. Method 2: "Tinking" the Bind-Off (Yarn Not Cut)