how to completely uninstall AirBeam TV? I installed AirBeam TV for streaming to a non-Apple TV device. 

I have now uninstalled it but somehow the audio driver is still installed when I check the sound setting. It is annoying that very often I have to go and change the setting to 'Internal Speaker' as it keeps defaulting back to AirBeam TV. 

Is there a way I can manually delete this. Note that to Audio Driver for this streaming app was downloaded separately and I just clicked to run it. It has somehow installed into a directory which I do not know how to navigate.
From https://www.airbeam.tv/faqwd/how-can-i-uninstall-the-airbeamtv-audio-driver-2/

First, find out what driver version(s) you have installed. Go to
System Preferences -&gt; Sound -&gt; select the Output tab. Look at the list
of the sound output devices.
If you see “AirBeamTV Audio”, you have
the audio driver version 2. To uninstall it, you need to delete
/Library/Audio/Plug-Ins/HAL/AirBeamTVAudio.driver
Detailed instructions:

Open Finder
Use the menu “Go” -&gt; “Go to folder…” (or press Shift + Command + G)
Copy the following path: /Library/Audio/Plug-Ins/HAL
Click “Go”
Delete “AirBeamTVAudio.driver”. You will need to enter the administrator password because this is a system location
Reboot your computer. After the reboot the driver will disappear in the system sound preferences

If you see “AirBeamTV”, you still have the audio driver version 1. To
uninstall it, you need to delete /Library/Extensions/AirBeamTV.kext
Detailed instructions:

Open Finder
Use the menu “Go” -&gt; “Go to folder…” (or press Shift + Command + G)
Copy the following path: /Library/Extensions
Click “Go”
Delete “AirBeamTV.kext”. You will need to enter the administrator password because this is a system location
Reboot your computer. After the reboot the driver will disappear in the system sound preferences