I tried to sign up for Yahoo360.But it says MY email is already in use CHANGE my email.How is MY email in use?

Try signing into another yahoo service, such as your mail account, and then go to http://360.yahoo.com. Works for me every time.

You have a 360 space for each Yahoo account. It stays dormant until you activate it. So, if you have ownership of both Yahoo IDs - the one you are using now and the one that they say is being used - then you just need to sign in with the ID that you want to use for 360. If you didn't create the "used" Yahoo account, then it's not your account and you don't need to worry about it. If you did create the "used" account, but forgot your password, go to http://help.yahoo.com/l/us/yahoo/edit/id_password/edit-20.html or http://help.yahoo.com/l/us/yahoo/edit/id_password/edit-13.html . Just click the teeny tiny "Sign In" link at the top left of the http://360.yahoo.com page and then click the teeny tiny Yahoo! 360 Home link at the upper right of the page to get to your space, instead of the big Yellow Button to see what happens. Make sure that no other Yahoo service is activated when you first sign on (even Messenger or Mail). When you get this figured out regarding your accounts, then you can do as suggested by Maegan.