How do i get a yahoo mesenger ID?

yahoo msngr is downloaded on my computer, but i myself dont hasve a messenger id, i am new on yahoo, my brother uses messenger; i want it too, but i dont know how to, do i just sign out his and sign in on my yahoo id and it will automatically appear, do i have to do something else? please help, i will try to remember to pick best answer~~ 10 points!!

How do i get a yahoo mesenger ID?
Just sign out on his %26amp; type ur name in where is says yahoo ID then type in ur password it should work...if not restart your computer or redownload the program or u might have go a new ID wrong!...good luck