Awesome @Eduardo-Lezcano, that's good progress.
There are two reasons the voice commands wouldn't show up on the website:
The voice field for the computer is empty. Use the Edit button on the website to fill that in. The voice field for the command is empty. Use the commands.json to fill that in ("voice":"firefox").Can you verify both of them have a word in them? For a Raspberry Pi I like to use the word "pie" in the computer's voice field because it's what Alexa or Google Assistant think you're saying when you say Pi.