It’s supposed to be an easy patter! It says to: sl 2 tog knitwise, k1, p2sso. What does this mean?
P2sso means to take those two stitches that you slipped and take them over the knit stitch and drop them off. It’s a decrease.
Here is a You Tube video of this exact stitch.
Yours may not be in the center like this so ignore that part, just watch the technique.
Slip 2 sts as if you were going to knit them together, knit 1 and pass the 2 sl sts over it.