I am reading about how radio communication works and I have an unanswered question.

We have wideband channels with 25kHz of radio spectrum. The transmitter modulates a signal and sends it.

The receiver that captures that particular channel and receives the signal.
But how does it know to which frequency it has to tune in?

There is a 25 kHz channel size, so there are so many different frequencies that it could be as the signal is modulated. How does the receiver decide?