Lock: press GREEN. A lock icon appears. A locked channel requires the password when Channel Lock is enabled in Menu > System > Parental Lock.
Move: press INFO, select the new position with the up/down arrows and press OK.
Delete: press 1. To delete all channels of the list, press 3.

When you exit the list, confirm to save your changes.

Can I pass the cable signal to another device?

Yes. The CABLE OUT connector passes the cable signal through to another receiver or a TV (loop through). Connect a coaxial cable from CABLE OUT to the cable input of the other device.

How do I check the signal quality?

Go to Menu > Channel > Channel Information. The screen shows the technical data of the current channel and three signal bars:

RF Level: signal strength, in dBµV.
BER: bit error rate. The lower the value, the better.
C/N: carrier-to-noise ratio, in dB. The higher the value, the better.