Re: cant change my password

There isn't a specific "DA2" password.  At first, it would have been your "BioWare Account" password. (You had to establish a BioWare Account in order to register the game.)  Then those were merged into an overall "EA Account" a few years ago.

To change your password, fire-up EA/Origin and from the top-line menu go to:

Origin --> EA Account & Billing --> Security--> Edit

(Or go straight to your account settings at: https://myaccount.ea.com.)