Sorry it took so long to get back, how would I get this variable to appear in text?Looks like this is what you're after:
https://stackoverflow.com/questions/40424298/find-os-username-in-nodejs
https://stackoverflow.com/questions/27895127/node-js-getting-current-windows-username
https://nodejs.org/dist/v6.0.0/docs/api/os.html#os_os_userinfo_options
You can use the "Script" part of a Control Variables event command to set it. Note that this would only work on desktop deployments, not web deployments.