As you may have noticed, we have completely overhauled TradingQ&A and migrated to a brand new and highly sophisticated community system / discussion forum. If you had an account prior to this switch, you'll have to use the "forgot password" under login to reset your password. The old password will not work.
More importantly, if you had spaces, dots or other special characters (except underscores) in your username, they're now gone. For example "Nithin Kamath" becomes "NithinKamath" and "Nithin.K" becomes "NithinK". You can always edit your profile and change the username to something else if you want.
Once again, welcome!