All you need to do is enter the URL address. If you are connecting AVKANS PTZ Cameras, the URL address is rtsp://ip:554 for most of our cameras. If it is AVKANS Move 4K Camera, pls remember the URL address is: rtsp://ip:554/stream1 If you have a 4K Camera, please set the IP streaming video to 1080P, as our camera controller display doesn't support 4K. For example, your camera IP address is 192.168.1.100 You have to make sure the URL is: rtsp://192.168.1.100:554 Then you can preview the video from the controller. If you are connecting to other brands of PTZ Cameras, do pls get the right RTSP address from your seller. Some of the PTZ cameras require you to enable the RTSP function, so you will be able to see the preview. Any question, pls let us know. [email protected]