Turn the rotary knob to display all receivable DAB stations. Press the rotary knob once and the station is tuned in. There are no fixed presets. Scroll up or down the list and select.

In fact, I've found that all you have to do is press and hold down the central button and choose the corresponding display

If you go to the station selection, you can select DAB and then select the correct station using the rotary knob.