First of all, NEVER use the same password on d2jsp that you use in other places. That said, a lot of people do, unfortunately, and of course end up keylogged and losing their account(s) in various places, including here. This is an added security feature that will help protect against it provided that you have a gold password and have this setting checked. To use it:
Go to Settings, then scroll to the bottom:
[*]
Require Gold Password to Login 
check this box!
It will now require your gold password to be entered at the login screen of d2jsp for your account.
Spread the word! Don't let your friends follow poor account security practices.
*I may turn this on by default in the near future! Heads up!*
Thanks for your attention.
--Paul