Page 74 of the manual explains it:
1. Using the Universal Remote Control
1. Select the mode(PVR, TV, DVD, AUDIO) you want to set by pressing the corresponding button on the
remote control. The button will blink once.
2. Keep pressing the button for 3 seconds until the button lights on.
3. Enter the 3-digit code. Every time a number is entered, the button will blink. When the third digit is
entered, the button will blink twice.
4. If a valid 3-digit code is entered, the product will power off.
5. Press the OK button and the mode button will blink three times. The setup is complete.
6. If the product does not power off, repeat the instruction from 3 to 5.