Hi @RonicaRooks,
I think there might be a bit of confusion somewhere. Canvas Commons is an area teachers can use to share their own resources or access resources shared by other teachers and import them into their own courses. It's not a place where you would enroll for a course.
You may want to contact the person responsible for the Open for Anti-Racism course to clarify how you're supposed to enroll.
Everyone here is able to help out with general Canvas questions as part of the global user community, but unfortunately won't be able to help much for a specific course enrollment question like this.
-Chris