To set record, you need to install a hard drive to the NVR. When a hard drive is installed, the system will record in 24 hours mode automatically as default setting.

You can set record in this way: 

go to system setup - record setup - record plan and set time for your recording:

 

 

You can also set motion detection recording: click motion---choose time clips---apply---ok

  

You can watch motion detection recording by click on Video Playback

click on Motion to get the motion detection recordings.