Loggin in to octoprint

I just succesfully connected my pi 3 b to my 3dprinter. Had the octopi interface working. I shut down the raspberry in octopi (top bar) and closed the octopi screen.
Now I want to get back into the octopi screen and connect with my pi. But how?
Octopi.local does not work. The ip address in the webbrowser does not want to connect either.
What is wrong? Do I miss something obvious???

To get this right: You shutdown OctoPrint with the icon in the navbar menu?
After that, did you take the power off and then on again?

Hi,
I did not put the power back on again. Somthat will start it up without damaging it?

Yes, it should because you safely shut it down.