You want to mark the "center 56sts" for the neck. Starting with 78sts that means there are 11-56-11sts with the markers at the hyphens.
With the RS (public side) facing, count from the point of the left needle from right to left, the direction in which you knit.
Place the markers as indicated above and bind off 3sts. Knit to the first marker then place the 8sts on the right hand needle on a stitch holder (a holder or scrap yarn). Bind off 56sts. You'll have to drop the second marker in order to bind off that 56th stitch but that's ok.
The stitch count (22sts) is incorrect. Because you've bound off 3sts at the beginning of the row, there should only be 19sts (11sts on the needle and 8 on the holder).
Did you also see the errata, here:
It may have already been corrected in the version you have.