Go into professional menu by pressing mute, left, right, up, down, ok
Navigate to Advanced->Select TV control app->SICP Control
There was a special app created for installer to be able to specify the custom input source app.
If the option is not there, that means, it needs to be installed
The easiest way to install the app is to clone in from this BFL with Fusion 2.3.6. app installed
Procedure to clone in is in this link below
Once it's been installed, you should see the option as per the previous instruction above.
Work-Around:
Alternatively if the above is too hard, you can also do this.
Go to Prof Menu
Set Switch On Setting->Feature Settings->Switch On Feature = Apps
Set Switch On Setting->Feature Settings-> Switch On Feature = Apps
Set Switch On Setting->Feature Settings-> Apps = Your App
Turn TV Off 06 00 00 18 01 1F
then
Turn TV back On 06 00 00 18 02 1C
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