If another account comes up, log out of it by clicking the down-pointing triangle in the upper-right then clicking "Log Out." If you then still can't log in to your account, click the "Forgot your password?" link located just below the password box on the login page. If you get an error message, what does it say?
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Point your web browser at http://www.facebook.com
If another account comes up, log out of it by clicking the down-pointing triangle in the upper-right then clicking "Log Out."
If you then still can't log in to your account, click the "Forgot your password?" link located just below the password box on the login page.
If you get an error message, what does it say?