Teaching Assistants access peerScholar through D2L/Brightspace exactly the same as students.
Make sure they are set up as Teaching Assistants through D2L/Brightspace first, and once they access peerScholar, they should be listed under the Teaching Team.
1. Teaching Team: To view the teaching team, click on Teaching Team on the sidebar on the left.
2. Role: To give access to your TA to grade make sure their role is set to Grader or Builder (based on your needs) by clicking on the option in the role column.
Now you may assign students to the TA in the Customize Grading Menu and allow your TA to mark student work.