Its been a while that some user in room is using strange Yahoo Id, see in the picture.
They have an Yahoo ID with very long underscore or underline + domain name .
So here the simple tutorial if you don't know how to make it :
1. Make your new Yahoo ID, or you can just use your Main Yahoo ID .
2. Make a valid email address, any email address, Yahoo dont care even you use your work Email !
ie : __________name@programmer.net
3. Login your Yahoo ID, go to your account and add alternate email address, add __________name@programmer.net then make it Primary Email.
When you add alternate email address Yahoo will automaticly send email verification to your entered email address, click the link that yahoo sent to you to verify. Dont forget to check the box!
4. Use the link below :
http://edit.yahoo.com/config/list_alias?.intl=us&.src=ym&.done=http://mail.yahoo.com&.donemail=http://mail.yahoo.com&confirmSelect=1&profiles=1&aliasSelect=__________name@programmer.net
Change __________name@programmer.net with your own email address
then enter, it will go to chaptcha image to verify, if you done this step the you ready to play.
5. Signin your Yahoo ID, before join the room choose __________name@programmer.net as profile then join. Youre done !
There is many free domain name to use as your email address, but if you are not satisfied with free domain name you can contact me to set it up for you using your own desire domain name .