Ken, I am going to have to (partly) disagree with you here.?
?ON the emails I get?(which are digests, which I presume is what Charles is getting), those instructions are NOT at the bottom of the emails.? This is the case for all of the digests I receive.
Charles,
You need to go to the "Manage My Groups" button, not the "All my Groups", or use that link that Ken gave you.
It could also be that Yahoo was having a bad day when you were looking. That seems to be more and more common.