How to Use Stitch Markers
I don't understand this:
Keeping stripe pattern correct k23 k2tog place marker, k2tog k23, dec one st each side of marker in every forth row until 38 sts rem.
What is a marker and how do I do knit with a marker in?
A marker is a tool that sits on your knitting needle between two stitches on your needle so that you can find that point in the row quickly and easily.
Generally you can buy stitch markers from any store that sells knitting yarn. Although they vary in terms of decoration, most will have a metal loop that fits over the knitting needle with something decorative hanging from the loop.
When you get to the point in your row where you are instructed to place your maker you slip the loop over the tip of your right hand needle and then knit the next stitch.
When you are knitting your row, you just slip the loop of your stitch marker from one needle to the other when you reach it.
You don't have to buy stitch markers though, usually what I do is to tie a short length of yarn in a different colour around the right hand needle to serve as a stitch marker.