Your instructor may have added you using an external account. If so, here is how you would accept the course invitation. 

1. Click on the course invitation in your mailbox. Be sure to check your junk mail if you dont see it in your inbox.

2. Click Get Started

3. Click Accept

4. Enter your password. You will need to save this so you can log in to canvas later.

5. Click beside I agree to the terms of use and privacy policy

6. Click Register.

You will now see your course.  Please note your email address would show up in discussions so you should change your display name by clicking settings on the top right hand side and choosing edit settings to access your personal settings.