Once your account is created by UC San Diego Extended Studies staff you will receive an email prompting you to complete your account registration.
The email will be sent from UC San Diego Extended Studies DES Open <notifications@instructure.com> with the subject line Finish Registration: Canvas.
Open the email and click on the link to finish your registration process.
Enter a secure password of your choosing and click register.
You will be taken to your Canvas Dashboard and if your course has started you will see it listed. Courses become visible on the start date.