Hm... are you sure you're typing it in correctly? If you are, then your caps lock button might be on. It could also be because the passwords are sensitive; and what I mean by that is you have to type in the password with the exact same keys you used when you signed up. (What I mean is, with most keyboards there's two different sets for numbers. So, if you typed in the password with the number keys on the top of your keyboard, and suddenly you use the other numbers keys, then it would still count the password as incorrect.)