Follow each set of instructions step by step, it may help if you copy and paste them into a file and put each one on a separate line, like this:
"On next Right Side (or knit) row, knit 22 stitches and slip these stitches to a holder (left shoulder stitches). " - just do that.
"Knit the next 16 stitches and slip these to another holder (front neck stitches), knit to end. " - do what it says.
Okay, so now you're just going to work on the last 22 sts and ignore the center sts and the ones for the other shoulder.
Row 1: Purl - purl across 16 sts
Row 2: Knit 1, ssk, knit to end. - k1 and dec, then knit the rest
Repeat these two rows until 17 stitches remain. - keep purling on the WS and k1, dec, k the rest of the sts until there's 17.
Continue in stockinette on these 17 stitches until piece measures 11 inches from cast on edge. Slip stitches to a holder." = Knit and purl these 17 sts until the whole piece is 11" long, then put those sts on a holder.
However, I see a problem - you say you have 50 sts but I think you should have 60 because 22 +16 + 22 = 60. So count your sts again and see what you've got, these instructions won't work with 50 which may be why you're having a problem.