How to work a Norwegian purl
Holding the yarn in your left hand and at the back of the work, take the RH needle behind the working yarn and insert it purlwise into the first stitch. You may find it easier to hold on to the stitches on your RH needle with your right index finger. (Figs 1 & 2)
(Fig 3) Changing the cross of the needles, take the RH behind the LH needle, then (Fig 4) take it over, and then (Fig 5) under the working yarn, at the same time looping the yarn around the needle anti-clockwise, creating what looks like a yarnover on the needle.
(Fig 6) Change the cross of the needles again, bringing the RH needle back around to the front of the work, then (Fig 7) bring it down and through the loop on the LH needle towards the back, (Fig 8) angling the new stitch over to the right slightly to avoid picking up the working yarn, and slipping the now worked stitch off the LH needle.