Hi and welcome to Knitting Help!
Poke the right needle into the stitch 3 rows below and wrap the working yarn around the needle just as you would if you were making a knit stitch. Now pull that loop of yarn through to the front of the work and up so that the left needle is back up in position to knit the next 2sts. It's best to keep all of this very loose so that you don't pucker the knitted fabric. You want the knitting to stay flat and a long loop of yarn to lie on it. After you knit 2 sts, do this again.
It's similar to this stitch
from a Lionbrand pattern. In this case the long loop is placed on the left needle and knit but your pattern doesn't seem to indicate that.