Node-red autorun

I have a Raspberry pi B+ and installed node-red.
After first install, i’ve been able to access it from web browser on my laptop htt://
I had then to install other pre-packed software from DietPi launcher, reboot, and now I cannot anymore access from the browser. I need to access SSH to terminal and launch node-red from command line.

How can I let node-red autorun?

Thanks in advance.