Boxlight is starting to phase out Unplug'd starting with the newest update. We'll have you connect via an app called Clevershare now. It should already be on your Boxlight panel. From the home screen:
Tap the app drawer icon (dot grid) in the lower right corner.
Tap the Clevershare app to open it.
From there you should see the ID of your panel in the upper right corner. It it circled in red in the image below:
From the settings menu in that same screenshot, you should set "Support Airplay Devices" to on. Otherwise your panel will not be visible from your computer.
You'll connect to your screen the same way as with Unplug'd. From the Screen mirroring menu in the upper right corner of your computer. Here's an image of the steps for that:
Please keep in mind both your computer and the Boxlight panel need to be on the same wi-fi to communicate. Let us know if you have any questions or problems.