HELP! Reading a pattern

[Ivy19]

Another newbie question: from a pattern in the (supposedly) "very easy" Vogue pattern book for an "easy striped pullover." (Notice the abundance of "easy's???") Anyway, in neck shaping with 104 stitches, the pattern says to "work 36 sts, join 2nd ball of yarn and bind off center 32 sts, work to end. Working both sides at once, purl 1 row"

So, I'm thrown off by the "work to end" since I'll have 36 sts left after binding off the center 32 . . . and I have no idea how to "work both sides at once"

Any help is appreciated. ("easy" my foot!)