difficulty logging in to Yahoo groups

HI there - Elaine from Step One suggested I contact you regarding the trouble I have had with logins - not only with the Step One class - ultimately that seemed to work out, though I registered twice and they had both different names listed on the class list. NOw, the class is over and I am trying to login to join the breakfast group and the same thing is happening - it says my "ID is not yet registered, or am I trying to register?" Every time I try, it seems not to recognize the username or the password, though I have gone through the registration procedure twice already! Frustrating! Please help - thanks. Diana