HP MR4000N - Manual (Page 21)

Using the HP HDTV Tuner 13
4 Use the remote control number keys to enter the channel you want to add or delete.
Or
Use the Up and Down arrow buttons to go to the channel you want to add or delete.
5 Press the Select button on your remote control to add or delete the channel.
Fine tuning channels
Fine tuning manually adjusts the TV’s tuner. Follow these steps to fine tune a channel:
1 Press the Menu button on your remote control.
2 Highlight Channel, and press the Select button.
3 Highlight Fine Tune Channel, and press the Select button.
4 Highlight Manual, and press the Select button.
5 Use the Up and Down arrows on your remote control to adjust the tuning.