How do I change my display name when I enter a chat room?

I don't want the people in the chat room to see my real yahoo id. How do I change my display name when I enter a chat room?
Click messenger top left in the messenger window. scroll down click my contact details. make your changes, click save and closeHow do I change my display name when I enter a chat room?
when you are chattng you can tell them is not your name but i don't you can change it cause you alredy put your name you can oly change password i think but you name is not funny right
create another id

when you open an im, just click the drop down box, it will show all your profile id names, pick the one you want and message....just be sure you do this each time

Good luck