Before match code please delete the corresponding channel to spare a channel out for a new camera, then you can match and add new camera into the channel.
Tips:Delete channel--In the Video Manage, select a channel from below box, click delete. The camera will be deleted from the channel.
Step1. Please refer to below picture to connect the camera to the NVR.
Install antennas for cameras and take it close to the NVR; Then plug the camera to power adapter and use a network cable to connect the camera to NVR's WAN port.
Step2. Right click mouse in your system to enter main menu, then click Video Manage (or Device Manage) to enter device manage interface.
Step3. The above box shows info. of your cameras, the below box shows channel info. of your NVR.Find out your new camera on the above box and select it (If you don't see your new camera, please click Refresh). Select an unoccupied channel of your NVR from below box, and click "Match Code”, Then click the YES to continue matching code. It will take seconds for the camera and NVR to get connected.
Step4. After it's successfully connected, you should see Status change to "Connect Success" on the channel. Camera information will disappear from above box. Camera is now successfully paired to the system.