To enroll in a course, you first have to sign in to your account at lagunita.stanford.edu/login. Then, click the "Courses" link at the top of the page.
This link will take you to lagunita.stanford.edu/courses, where you can browse current and past courses offered on the Lagunita platform. Use your mouse to hover over the tile of the course you want to register for. Clicking on the course tile will bring you to the course About page. From here, click the Enroll button to register for the class.
And that's it! The course will be added to your Dashboard page. Some instructors create a registration confirmation email for their courses, but not all do – so don't worry if you don't get a confirmation email regarding enrollment right after you enroll.
If the course has already started, you'll see a View Course button next to the course title on your Dashboard. Click that button to enter the course. If you don't see a View Course button, your course hasn't started yet.