IF it's the same as in my '06 Gransport, hit the button with an icon that tries to look like a radio tower transmitting. You will see three items on the display: FM, AM and MAN. Hit the button under the MAN, twice. You can then tune manually. Once you stop tuning it will default to 'automatic' tuning to your preselects and also identity stations from Andromeda and other galaxies, so you'll have go back to the manual selection process.
Learning how to use this radio has prepared me for other arcana, such as reading ancient Assyrian on stone tablets and reading prophesy from goat entrails.
On the QP's, below the info screen look at the left knob, the knob you use to turn the radio on/off and adjust the volume. To the left and right of the knob you should have two buttons with arrows. Pressing the arrow on the right should advance the radio forward, the arrow on the left should go backwards.