It’s a very easy pattern.
Cast on 61 stitches (or slightly more or less depending on how big you want it) on 4.5mm (UK 7) circular needles.
Make sure there is no twist then start to knit into the first cast on stitch. (I sometimes do what I have heard suggested which is to cast on an extra stitch and then knit that together with the first one to give a firm join.)
Knit round to the start for the first row.
From now on Repeat (knit1, knit into stitch on row below) until tube is about 30ins (75cm) long.
With the rib looking side on the inside, roll up the last 10in (25cm) outwards to make a soft roll to frame the face and catch into place where the roll joins the tube with shirring elastic. Stitch nice and loosely so it doesn’t interfere with the tube stretching.
And there you have it.