If you are a member of yahoo and have a yahoo ID there is a part which says join the group but when you click it wants a new password which they sent it to your e-mail. if you look at your e-mail which you write to yahoo you will see the password which yahoo sent you.If you enter this password and your real password you will be able to join the groups and enjoy the photos:)) At first I also couldn't do it because of a problem with my e-mail then I changed my e-mail
Hope I could help to you Yifat If any other problem write there or to my personal e-mail.
Byee