To get image on the FRC SmartDashboard you need to have the RoboRio (running), FRC RPi and the radio (optional) in the same network. If you just want to see the image and configure various settings, go to http://frcvision.local or if that doesn’t work try to run arp -a in command prompt. Run that command several times until you see on the ‘Physical Address’ column an address starting with b8-27-eb-… Next to it will be the IP address of your RPi.
Alternatively, you can download “Angry IP scanner” and scan your network/subnet.
After that, go to Vision Settings -> Open Stream, next to Camera rPi Camera 0. It should open another tab http://frcvision.local:1181.
Launch the FRC Driver Station then click on the ‘gear’ and select SmartDashboar from the Dashboard Type menu. Once it launched (it takes few seconds), in the SmartDashboard go to View, select Editable. Then View, Add, CameraServer Strream Viewer. In few more seconds you should see the image from FRC rPi. Drag a corner and make the image as big as you need. Right-click over the image ‘Properties’ and select ‘Degrees of rotation’ put a number in there if you need to : 0, 90, 180, 270. Hope this helps.