Online Issues
Logging In.
Once you register your serial key then that key is tied to your account, to play online you will need to use your original account details.
Forgotten account details.
If you still have access to the email address that was registered with EA, then these links will help.
http://customersupport.ea.com/logina...tScreenName.do
http://customersupport.ea.com/logina...gotPassword.do
If you no longer have access to the original email address registered with EA, you will need to go to #support.ea.com and get in touch with a customer support rep.