Purl into the back of the stitch?

Working on “Opera Gloves” by Macandme and instructions say to “Purl entire round into the back of the stitch (this will be the fold line for the hem).” I am bewildered!

I am not sure if I am doing this right! If I go down throught the top back of the stitch, I have a “knit into the back of the stitch.” Do I come up from the BOTTOM on the back of the stitch and grab the yarn through there and draw it down and out the rear? I’ve never seen this before. HELP!!!

OOPS! I answered my own question! I found the video and I guess I figured it out.

Go to the Glossary tab at the top of the page. Scroll down until you see ‘purl’ and it is the next definition… there are 2 videos. I hope this helps.