Playing GW1 with a GW2 account.
If you are asking how to access your Guild Wars account, and it is linked with your GW2 account, you would enter your email address, password, and character name.
Good luck.
Keep in mind that the password you use to log into GW2 is now the same for GW1. Once you linked the accounts, they were synchronized to match, even if you used to have a different password for GW1.
Thank you for the replies. Basically i was wondering if i still have to input the unique serial code that comes with each game, normally they are 15 digits in length or longer.
Basically i was wondering if i still have to input the unique serial code that comes with each game
No. Why would you? Once a serial code has been linked with an account (e-mail address and password), it remains associated with it no matter what.