i need to sign in to two different apple ids on my new macbook

When i was first setting up the macbook a few minutes ago, it asked for my apple id...i put in the one i use for i tunes but when i try to logout out of in inside of iCloud to login to the correct apple id for iCloud, it doesn't give me the option to sign out without setting up a new special password for the macbook. How do i sign in to a different apple id on only icloud??