Hi, Caty
What has happened is that you've installed the, 'standalone' version of VoiceAttack from the VoiceAttack website. VoiceAttack comes in two versions: the standalone version and the Steam version. The standalone version requires a registration key, while the Steam version of VoiceAttack only requires that you install it from the Steam client.
What you'll want to do first is uninstall the standalone version of VoiceAttack (or, simply delete the VoiceAttack folder, which is usually C:\Program Files (x86)\VoiceAttack). You should be able to launch the Steam version of VoiceAttack from the Steam client without the need for a registration key (you actually don't even need the Steam client if you launch VA from its Steam-installed location - that's another story, though).
The other problem it looks like you're having is that VoiceAttack does not come with any Elite Dangerous commands. This is correct, as VoiceAttack is not built just for E:D, but for most games and apps. You will want to either build your own library of commands from the ground up, or acquire a library of commands from either a paid or free source. If you want to know more about these libraries, feel free to ask about them here or (for way faster response) inquire over at the VoiceAttack Discord server:
http://voiceattack.com/discord If those options are not appealing or seem like too much work, you'll want to be sure to get a refund from Steam before the time runs out.
Hope that helps!