Hi @TracyAlesia,
The terminology there is a little weird, as you wouldn't really "email a course." Could someone perhaps be asking you to add the students into your course shell manually (if teachers at your school are allowed to do that)? Canvas enrollments are often handled by an integration with a school's student information system, but maybe that process at your school does not work with late adds. I'd honestly suggest asking one of your school's Canvas admins (usually in the eLearning / IT / Digital Education areas) for clarity about what the request might be.
-Chris
