@CeciliaPelayo …
Are you able to see your course(s) listed on the “Courses” >> “All Courses” screen when you are logged in to Canvas? If you can see them listed there but the courses are not yet published, then your instructor(s) has/have not published the course(s) yet so that you and your classmates can get access to the content. If the course(s) are not listed there at all, you may need to reach out to your school’s Online Learning / eLearning / Distance Education department to see what might be going on. They may need to do some further investigation on their end to get you access to the course(s) you are looking for.
Keep us posted here in the Community…thanks!