I-Cord BO

I am a beginning knitter and have difficulty following directions. I’m knitting a felted bag that says to BO using the I-Cord method. I’m using circular needles. It says to cast on 3 stitches, but if I cast on the right side (where the yarn is) I don’t understand how or where to knit it. Is there a video showing this? Thanks!

There’s no video on this site, but this page might help.