wl is the equivalent of a yarn over. To work 8 sts into the yo, you can k1,yo,k1,yo,k1,yo,k1,yo into the same st or you can k1, p1,k1, p1, etc. into the yo. The first part of this video
shows you the k1,yo,k1in one st. You would just continue until there's 8sts. Do it loosely so that you can get that many sts from the yo.
Then do you knit or purl the increased sts on the next row? Is there a Sirdar pattern number?