Icelandic Cardigan pattern help please

Pattern says to K into right side of the stitch below the stitch you are about to knit, k1, k into left side of the stitch below the stitch you just knitted. Not sure what this means and if I am just knitting into bars to the right and left of the stitch I am to knit to create an increase of two stitches. Thank you for any help explaining.

Welcome to the forum!
These seam to be right and left lifted increases.
In this video it’s the second of the two increases that Eunny Jang demonstrates (3:25min).
https://www.youtube.com/watch?v=oqvh3wP3eaw

What is the name of your pattern and designer?

Pattern “Vorsol”
Designer Vedis Jonsdottir

Thank you so much!

Beautiful cardigan. Thank you for the information.