Chromecasts are now installed on a number of displays around the church property, allowing you to wirelessly mirror your device screen or play content from your device.
You need to be connected to the church's Wi-Fi networks in order to cast. For most users, this means connecting to the "MCBC Guest" network. Corporate users: see this article
Note that due to the size of the church network, it can take up to 2 minutes at times for a Chromecast to appear when selecting the device you want to cast to. If the device does not show up after an abnormal amount of time despite being connected to the church network, get support from an IT team member.
To cast your device screen:
Windows & macOS devices: Open Chrome browser, click 
(three dots, top right) and then Cast
Android: Download the Google Home app, select the cast device and then tap 
Cast my screen
iOS: Download the TV Mirror for Chromecast app, select the cast device and then tap TV Mirror
Playing a YouTube video:
Windows & macOS devices: Play a video in the Chrome browser, then click 
Play on TV
Android & iOS: Play a video in the YouTube app, then tap 