Help with knitting pattern, neck shape

Can you explain what I need to do here.

Shape neck- next row K13 turn
Cont on these 13 sts.
Dec at neck edge in every row (4) times…(9) sts

Knit 13sts and leave the remaining sts on the left hand needle unworked. You’ll get to them later. Turn as you would at the end of a row, work one stitch and then work 2sts together then work back to the armhole edge. On the next row, knit to 3sts before the neck edge, work 2 together and then work the last stitch. Continue with the decreases like this on each row at the neck edge two more times.
It’s nice to put these decreases one stitch in from the edge for a neater edge.