Yf twice?

Hello everyone!

I had rented a wonderful pattern dictionary book from my library. I was exploring the “Birds Eye Edging” and I’m confused on something here

“k1, k2tog, [I][yf] twice,[/I] k2tog, [I][yf] twice[/I], k2”

How do i exactly do a yarn forward twice?

Thanks everyone!

2 YOs…


Do a yf, then do another yf… videos under yo I think on this site.