Problem when installing

[SrPeter]

Linux version: Red Hat 4.8.5-16

Hello!
I am actually trying to install NodeBB in a shared hosting, so im using the terminal. I have all the files in the correct folder, but when I try to "./nodebb setup" I get this:
/usr/bin/env: node: No such file or directory
I am assuming bevause i have got Node.js installed, but I cant seem to install it with any commands from https://docs.nodebb.org/installing/os/