Usually, we can access the DVR system on website www.xmeye.net with its SN. Here is the method: https://support.sannce.com/hc/en-us/articles/900000447266. But we can also log in to the DVR system on the browser by its IP locally, not by SN. Here is the method.
1. Connect the DVR/NVR system to the router with a network cable.
2. Find DVR's/NVR's IP address on the monitor of the security system.
3. Get a computer that is connected to the same router since DVR/NVR is to access DVR with its IP address on the browser. The default user name is admin and the password is blank.