I follow the exact instruction to install Genymotion emulator. After setting the path and can run adb from terminal. I got the message as follow.
Couldn’t start project on Android: Error running adb: No Android device found. Please connect a device and follow the instructions here to enable USB debugging:
https://developer.android.com/studio/run/device.html#developer-device-options. If you are using Genymotion go to Settings -> ADB, select “Use custom Android SDK tools”, and point it at your Android SDK directory.