How do I add a virtual background?
You can do this by going to the portal (http://uic.zoom.us), Settings, In Meeting (Advanced). Find the entry for Virtual Background and make sure the option is turned on (blue will show instead of gray). Then, when you open the application, click on the dropdown next to start video and choose a virtual background. For Windows users, it seems that Zoom often requires a green screen to do this same thing, just an FYI. You can also change your virtual background in the mobile apps. You can find some UIC virtual backgrounds here https://uicflames.com/news/2020/3/31/fire-up-video-conferences-with-uic-backgrounds.aspx.
Note that Zoom has specific requirements for using a virtual background.