You must improve the radio signal as above first, then hold down SET on remote control and the switch will Auto Search stations. Then scroll through stations there should be more there now. (Typical 10 stations should be picked up).
Ensure the radio aerial is vertically mounted with 0.5m at a 90 degree angle, this will improve the signal vastly, otherwise the signal will not pick up many channels. signal strength will be dampened by metal objects and distance from radio antenna ...