I see. Thank you Mirl, for finding that.
You're going to put both of the legs on the circular needle, leaving the inner crotch stitches on the waste yarn for now.
Then, place a marker on the needle right before the left leg starts as it's facing you. Count the stitches on the leg and put a marker half way around where the side would be.
This marker will be the beginning of the round, so slip your stitches to that point and begin knitting, putting a marker at the other hip, halfway around.