How do you find a person's Yahoo screen name by there real name?

I had a friend I use to talk to and I know her real name but cant remember her yahoo screen name

I tried to make a purchase from somebody that used a yahoo idea. they scammed me out of 3000.00 dollars and I want to find out who they are? any help?

If I didn't want my name to appear or I wanted to change my name how would I delete/change it. For example, when you first click on your little yellow smile the IM box comes up - I would like to change my name that appears there.

yahoo screen messanger is connahey08201

how can i call to report it when someone online tells me that person using my screen name ??

i need to find this person to have hom arrested for stalking and harassing my family

I had cool screen name for yahoo. was able to check my mail fine. So I decided to download yahoo messenger. When I tried to use my "cool screen name" with this, got a message that said my screen name was taken? But it's mine!! So I had to come...

i need to know how to cancel my yahoo screen name on my mobile phone and also how to get rid of yahoo mail on my mobile phone and every thing to do with yahoo on mobile phone and web yahoo how do i get that off my mobile phone and if i cancel my screen...