Usually, we can access DVR system on website http://www.xmeye.net with its SN. Here is method: 

https://hview.kf5.com/hc/kb/article/1032534/?from=draft

But we can also access DVR/NVR system on browser by its IP locally, not by SN. Here is method:

1. Plug the DVR/NVR system to router with network cable.

2. Find DVR/NVR's IP.

3. Get a computer which is connected to same router as DVR is to access DVR with its IP Address on browser. The default user name is admin and password is none.

Note: you have better used IE instead of other browser.

Make sure the address is as http://192.168.1.13 , not http://192.168.1.13/Login htm , because the broswer can’t show any image with this address.