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The POP3 password ***** be the password ***** login to your email account, I think.
So... open a web browser on your computer.
Go to the website of the email address, e.g. if the email address ends in @hotmail.com, go to
www.hotmail.com
or if it ends in @aol.com, go to
www.aol.com
Try to login there, with your email address, but with any old password (since you don't remember it.)
Then, when the system refuses the login, you use the
Forgot your password?
or similar link, to retrieve or reset your email password. Then, having the new password, you will know what your POP3 password *****