Kf&b - coco knits

knit through the front and back of the next stitch - this is from Coco Knit - I have no idea what to do - I’m thinking I need pictures to show me what’s up - can anybody help me?

Amy has a video here: http://www.knittinghelp.com/videos/increases

Knit into a stitch as usual, but leave it on the left needle, then knit into the back leg of it too.