Well that all depends on what you mean?
If you wish to alter the IR Channel then you go into the "System Information" screen and press the Down button until you see the Remote Address. Then hold down the TiVo and Pause button for five seconds and then press a number for the channel you want. Then press the Right button to let the TiVo know what channel it should accept.
If you wish to alter the RF Output frequency then you can do this via the Recorder Setup screen on a v2.5.5 (default is channel 60), or you will have to use palmod_config or edit the /etc/palmod.conf file on a v3.0 system.
If you wish to change the frequency the tuner is listening on, then you should just be able to use the Channel Up/Down buttons... assuming you have go a compatible tuner installed.
The resonance frequency of the TiVo can be altered by loosening or tightening the screws holding the hard-drive (and I am not being silly here... one of my TiVo's was a little noisy until I loosened the screws).
If you wish to increase the number of TiVo's you own via the remote then you will need to use the remote to type in
www.ebay.com into your web browser
A better description of what you are after would probably help
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