Hello @yawlhoo, not sure if you did this already… Assuming the OpenWrt install was successful, you would attach an ethernet cable from your laptop/desktop to Eth1, 2, or 3, of the LinkStar. Then log into the admin console from your browser at: 192.168.100.1 (NOTE you are referencing 192.0.100.1 in your earlier post).
Account name: root
Password: password
Good luck.