First ensure AI is enabled. Click on "DISPLAY" on the 2nd page. Then check to see if "AI Rule" is checked off. Hit "Apply" when done.
Then go back to the main page and click on "AI"
Click on Parameters > Smart Plans. Select the channel you want to enable and then click on the human silhouette. The box will turn blue. Click on "Apply" on the bottom right hand corner when done.
Under "Parameters" , click on "Face Detection" and check off the "Enable" box. Also check off "Record Channel" and click on "Apply" when done.
Next to "Schedule", click on "Setting" and set face detection schedule. Click "OK" when done and click on "Apply" one more time.
Go to "SETTING" and select "Schedule". Here you will select the Channel and then click on "Setting".
Check off "Intelligent" and click "OK". Click on "Apply".
Repeat the process for "Snapshot". Click on "Apply" when done.