@mega_big, on a Raspberry Pi, assuming you installed the agent using these instructions, your commands are in this file:
/root/.TRIGGERcmdData/commands.json
You'll see the default commands in there.
You can run these commands to edit it:
sudo su -
cd /root/.TRIGGERcmdData
nano commands.json
While the agent is running, it will detect changes in that commands.json file and create/remove triggers for those commands in your TRIGGERcmd account. If you mess up the json at all (an extra comma even), the agent will restore the last backup it took. You'll see that in your debug.log.
If you don't want to deal with editing text, you could create a command on your Windows PC using the "GUI Command Editor" then copy/paste the json text of that command from the "Text Command Editor" into your commands.json file.