As TAs you have the same features available to you as the professor, your access will just end when the semester closes, so please peruse the Instructor help pages for all the classics, like:
...
The Quest team is here to help support you with any Quest related concerns, set up, or familiarity tutorials–feel free to send us a note at questhelp@austin.utexas.edu (the best during these Fall 2020 pandemic times), call 512.232.1076, or (by appointment only during Covid times) drop by PMA (RLM) 15.320G (post pandemic). We want to hear from you and make your lives easier, and your input helps shape features that are
...
Communicating with Students: you can post class announcements, or if you need to just let a few students know something, you can grab their email off the roster (on the left side bar). This could take a few steps out using Canvas as the communication run around.
...