If you want to use App Managers advanced features, it is reccommended to setup ADB and set it to the TCP Port 5555 so App Manager can access it and locally execute ADB - Commands.
Open a Terminal, Commandline or PowerShell Window on your Computer and execute ADB (see the Complete Guide above for Details).
If you're on GNU/Linux, you can just install adb from your Distributions Package Manager.
Connect your Android Device.
Execute the following Commands: adb devices to check if the device is recognized ~ and then adb tcpip 5555 (with only the Android device you want to configure connected).
Open App Manager and go to Settings → Mode of operation and select ADB over TCP
If App Manager says »Working in ADB Mode« → Congratulations!
You're all set!