Hi Elana
Based on your Community profile and that you're wanting to assign your TA to a course, I'm assuming that you are an instructor. This means you will most likely be able to add users and assign roles to them in your course, but you won't be able to create a new role.
If there is no TA role set up, I recommend contacting your Brightspace Administrator who can either advise you which role has already been set up for TAs, or can create a new role with the relevant permissions which you can use going forward.
Hopefully this helps!
Regards
Natasha
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