Hello @AndreyFilev
Thank you for contacting the Canvas Community. We're sorry to hear you've been experiencing issues with signing up for courses within the app. Typically, all enrollments and class sign ups are done with your school directly. Either on the portal or speaking with the admissions office if you need assistance. In the off chance that your course is a self sign up course, you can join the course following this guide:
https://community.canvaslms.com/t5/Student-Guide/How-do-I-sign-up-for-a-Canvas-account-with-a-join-c...
If that does not apply to you, please speak with your school directly for enrolling in courses.
