Do you mean it remembers your username and password? That may be a browser feature. There are ways to clear that out, but I don't want to give an answer without being sure of what the question is.
Also, please start a new thread with new issues so that users that have similar problems can more easily find them, and please don't use the private area for anything that isn't truly private (usernames, passwords, phone numbers, etc).
The more information that is part of the public thread, the better the chances that someone can find the answer if they have a similar question.