Hello there, @grostami ...
If you are an instructor, you *may* be able to do this on your own using the Guide, How do I edit user roles in a course?. However, if you are unable to carry out these instructions, you will want to contact your school's local Canvas administrator or someone in your school's Online Learning/eLearning department...as they should be able to help you with this request. Good luck to you!
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