Red Alert 3: online

i have just re-installed my disk copy of red alert 3 ,

no problems with installation or patching , but when i try to connect with my EA account it says invalid password ,

then when i go to register a new account i see it is now connected with origin , so i tryed to use my new origin account to connect to Red alert 3 but still says invalid password ,

so if my origin account doesnt work , how can i play online , becuase now when you click the "register" account it redirects to new origin  account

registration , so im just confused as to what account do i need to play this online ?? none seem to work.

thanks