You should just be able to drop a "Camera" widget onto a tab of the dashboard.
When you click on the widget, a text box should show up allowing you to change the location of the camera's image stream. Something like this:
You need to change the address to the IP of your camera, something like this:
If after you set up the IP correctly it still doesn't work. Type that address into your web browser (while connected to the robot) and see if it works.
http://10.45.05.11/mjpg/video.mjpg
If you can't get the stream working in the browser, then the URL likely needs to be modified for your specific camera or the IP isn't correct. What model camera are you using?
What address/URL is working for you when the camera is hard wired to the laptop?
Are robot communications (in driver station) working when you are not tethered to the robot?