I follow the instructions and try to ssh the pi but nothing happens.
I suspect that something happens, but not what you want.
You don't say what you want to achieve by using ssh?
Typically I just open a web browser pointing at octopi.local (about half
the time that auto-completes to octopart.com but that's not important right
So, first, log in to your router and see if the Pi has connected to your
router. (probably 192.168.0.1)
Then try ssh to the IP address (I find ssh -Y is more reliable, especially
if you want to open remote X windows)
And then you can try octopi.local.