The Node-RED dashboard is an add-on to Node-RED to very easily build web-based dashboards
In the hamburger menu on the upper right, choose "Manage palette"
install package "node-red-dashboard"
make sure you see the dashboard nodes in your palette
drag and drop a couple of dashboard nodes in your flow. Click Deploy.
Your dashboard appears at http://127.0.0.1:1880/ui/
Add elements and see what you get
Take a screen capture of your dashboard