Actually I am using my id komolika_foruonly_yahoo.co.in but my sme friend get to know my password and now she is using that.and also she has changed the password now. I don't know my full details but I know user name. Can this helps me to know my current password or the way I can remove that id.

First its not a good idea to piggyback your question on someone else's. This can lead to confusion. You should start a new thread. So I've moved your question to its own thread.

This is a friend?? Someone who hijacks your e-mail account is NOT a friend. But the only one who can help you regain the account is Yahoo. Use the Help link until you get to a screen where you can e-mail them.