This solution is by @PuTTY at superuser:
NanoPI board to your local network (plug Ethernet port of NanoPI to the LAN port on your router), wait at least a minute to get time
NanoPi to start then use AngryIP scanner to find IP address of
NanoPI. If you use unix based operation system, use terminal/console to connect to your NanoPI by issue following command:
Where xx.xx.xx.xx is IP address you found with AngryIP scanner.
Default password for Ubuntu_Core_with_Qt-Embedded might be
fa (check documentation regarding
ssh password it could be changed since I tried it last time)
If computer you trying to connect from is Windows based operation system, you may use PuTTY terminal as SSH client.