If Open Gate Sangha has opened registration for a Online Course, you can register by browsing to this link, and clicking the "Register" button: http://www.adyashanti.org/cafedharma/index.php?file=webevent From there, follow the steps to register for the course.
If you've registered, and want to access the Online Course materials, please login to your account by browsing to this page: https://www.adyashanti.org/cafedharma/index.php?file=login&redirectto=webevent
After you've logged in, the course materials will be accessible from the right hand column of the page. Please start by clicking the "Participants ~ Start Here" link, and reading that page.
If you need further assistance, please submit a ticket to the Open Gate Sangha Tech Support Team: http://www.opengatesangha.org/techsupport