You'll need to be using an Apple device (Mac, iPad, iPhone, iPod Touch) and the device's OS (operating system) needs to support the use of AirPlay.
1. Turn on the projector/tv and choose the appropriate input for the Apple TV/AirPlay.
2. Connect to Westside's wi-fi network and make sure Bluetooth is on.
3. Choose to AirPlay from your device.
-Mac
-Click on the AirPlay menu icon in your menubar (near the date/time and wi-fi icon). The AirPlay menu icon looks like a rectangle with an up-arrow at the bottom. If you don't see the AirPlay menu icon then open your System Preferences, click the Displays icon, and checkmark the box at the bottom for "show mirroring..". If you're using MacOS 11 or newer then open the System Preferences, then open the Dock & Menu Bar settings, click on Screen Mirroring from the left-hand column, checkmark the box to "Show in Menu Bar" and select "always" from the drop-down box.
-select the name of the Apple TV you want to connect to (the name will be displayed on the projector/tv screen)
-use the options in the AirPlay menu if you want to change between mirroring your screen or using the AirPlay screen as an extended desktop screen.
-iPad/iPhone/iPod Touch
-depending on how old your device is you'll either swipe up from the bottom of the screen or down from the upper-right corner to open the Control Center
-choose Screen Mirroring (Might also say AirPlay)
-select the name of the Apple TV you want to connect to (the name will be displayed on projector/tv screen)
4. Enter the AirPlay passcode seen on the projector/tv screen if your device asks for it.
5. When done using AirPlay disconnect from AirPlay using the AirPlay menu on a Mac or the Control Center on an iOS device.
Troubleshooting Tips
https://help.westside66.org/a/solutions/articles/43000646240
AirPlay icon is missing from Mac's menu bar