Digital video recorder
Follow the instructions of the hard disk video recorder, because the operation of various hard disk video recorders is different. Go to official website, the hard disk video recorder you bought, and download the related instructions.
Computer monitoring
If it is software installed on the computer, just turn on the monitoring computer and watch the playback. For LAN viewing, you should know the account and password and ip address of the monitoring computer. The key is the account and password used for login monitoring.