Hello there!
NodeBB is designed to work best under a virtual private server. Using a traditional hosting service is not recommended as they do not have the capabilities to power NodeBB effectively.
The code and instructions can be found here at our project repository
Full instructions can be found in our Documentation Portal
We recommend DigitalOcean to host your NodeBB, you'll get a month free just by registering with this link.
Thank you for your interest in NodeBB!