Ok, there's a video to help out with this too. Assuming you're making the 3rd size, you've knit 7sts, now knit 2 more sts and pick up the 8th st and lift it up over the 9th and drop it off the right needle. That's one st bound off. Knit another st and do the same thing, lift the 9th st over the last st knit and drop it off the needle. Keep repeating this until you've lifted 6sts over and off (see video
if you need to). Then knit 55 more sts (it'll be 56 including the st left on the right needle after the bind off) and repeat the bind off for the second leg, then knit to the end of the row.