Thank you all for trying to help!
Here is the reply from the seller and a picture of the stole:
when you work the stitch you place the 3 stitches on your needle as if you are going to work a k3together. then you k p k and that creates the stitch.
And this is what she wrote when I told her I still do not know, if I have to k1, p1, k1 first and then try to knit these 3 together, which is almost impossible:
you place thwart three stitches on the needle as if you ere going to do a k3together and instead of the k3together do k p k then move to right side needle with new 3 stitches no stitches lost or gained
Forgot to mention - the pattern is the one between the cables