You just press sign out.
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You have to sign up for it.
I don't know what you mean by "ye-old," but curse words are not allowed on WikiAnswers website. It is against the TOU rules.
When you sign up for WikiAnswers, you are asked to choose your own username and password; you can personalize it from there during the sign-up process.(See the Related question on how to become a member of WikiAnswers.)
You don't have to login it is not mandatory.
You can't
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Yes, it is completely free to sign up for this website. WikiAnswers
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