Nothing is needed to play the early access other then registering your pre-order code that one time when you first got it. You will not receive access to play in the early access until you get an email from Bioware telling you when you'll be able to start, at which point you will then be able to log in at whatever time the email states. Unless you pre-ordered back in July, it's probably unlikely you'll be playing today, or even tomorrow. As was mentioned when you pre-ordered you'll gain access to "up to" 5 days early access(7 now if you pre-ordered early), in other words, that could be 7 days(today) or 1 minute of early access.