Table of Contents
The Welcome App is installed at /var/www/html and intended to help get you started.
It is reached via http://YourIP.com or http://YourDomain.com
You can remove the Welcome app, or replace it with your content by removing the contents of /var/www/html:
rm -rf /var/www/html/*
It has links to the demo Apps, as well as the Webmin login page and Docs.