You can't directly change the frequency of a digital receiver like you might with an analog radio. Digital receivers are designed to work on a specific set of frequencies, and changing them would require significant hardware modification.

Here's why:

* Digital receivers are tuned to specific frequencies: Digital signals are transmitted on a specific channel or frequency, and the receiver is designed to pick up only that signal.

* The frequency is determined by the transmission standard: Each digital standard (like DVB-T, ATSC, etc.) uses specific frequencies, and the receiver is designed to work within that range.

* Changing frequencies would require reprogramming the receiver: Modifying the receiver to operate on different frequencies would require hardware changes and potentially reprogramming the software. This is not something a typical user can do.

How to change the channel on a digital receiver:

* Use the remote control: Most digital receivers have a channel selection button on their remote control.

* Use the on-screen menu: You can typically navigate through menus on the receiver to select channels.

* Use an electronic program guide (EPG): This allows you to browse and select channels based on program listings.

If you're experiencing issues with your digital receiver, it's best to contact the manufacturer or a qualified technician for support.