One of the most reported problems of the our platform is "I'm unable to login, i forgot my password". And that's why you're trying to login using your "Email" instead of your "Username".
You're happy to know that now you can login through the Overhack using both your credentials! That's incredible don't you think?
Anyway the "Password recovery system" is now under development with a Verification Code system that will send to your email a "Code" needed to reset your password. So you're not able to change your password once logged in, but only in case of "Reset".
Have fun and be fair,