If you are not registered with Yahoo, follow the "Click here to register"
link! Fill in all the fields, and finally click on the "Submit this form"
button. The whole thing is quite tedious, but it is necessary to make
sure you are a real person and not a program designed to enter all groups
and send spam.
The former groups 'clgeneral' and 'clscale' have been automatically
canceled by Yahoo due to low activity.