In order to get a 7-day trial of Origin Access you need to:
- Visit Origin Access page
- Press the "Start Your Free Trial" button and log-in with your Origin account.
- Sign up for monthly/yearly plan
According to the Origin Access page, you can cancel your subscription anytime. If you cancel it before the end of the trial, you won't need to pay for the subscription. This promotion is available only for the people who never used 7-day trial before.