The name chosen for a profile or account that you need a password for.
If it is used with a password then yes, unless someone guesses or finds out what it is.
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go to your yahoo.com or whatever email address you put in then click mail it will say club penguin
If using Safari select Reset Safari... from the Safari menu. This will give you an option to clear Names and Passwords. If using Firefox: go to the Tools menu and select Clear Private Data... Tick...