Hi Jan and welcome. I think these directions are pretty good. You're going to be working on one shoulder at a time starting with the left shoulder (that's left as if you were wearing the sweater). Work as for the back, and make the armholes the right length for your size. With the outside (RS) facing, knit the next 10 (10-11-11-11)sts. Turn leaving the remainder of the sts on a holder or spare yarn.These are the center neck and the right shoulder sts. Purl back to the armhole edge. Now you again have the right side, the knit side facing you. Knit across to the last 4 sts. Sl1K. K1. psso (slip one st, knit one st, pass slip st over), and K2. Purl back across the row.
Rep last 2 rows until 6 (6-7-7-7) sts remain. So that's knit across to the last 4sts and decrease as above. Turn and purl back across the row.
Work 3 rows without decreases. Cast off.
Now you want to slip the held sts (the ones on the holder) onto the needles and slip the next 17 (19-19-21-21) sts back onto a st holder. Join a new end of yarn to remaining sts and knit to end of row. Purl 1 row. Next row: K2. K2tog. Knit to end of row.
Rep last 2 rows 3 times more. 6 (6-7-7-7) sts.
Work 3 rows even (no decreases). Cast off.
You'll end with the center sts on a holder and the two shoulder extending up at the sides and bound off.