Since some of the radio functions are intuitive and/or obvious (less writing for me)...I will stick to the programming aspects of the radio functions:

MANUAL TUNING/SEEK TUNING
The "" up manual tuning button has two steps. These buttons are used for both manual and seek tuning.

For manual tuning, press either of the tuning buttons one step. To tune to a higher frequency, press the right button; to tune to a lower frequency, press the left button.

For seek tuning, press the right or left button 2 steps (as far as it will go). The radio will automatically tune and lock onto the next higher or lower receivable broadcast frequency. When seek tuning the next higher frequency, the display shows SEEK UP; when seek tuning the next lower frequency, it shows SEEK DN.

SCAN TUNING
Signal scan tuning allows you to tune into each medium-to-strong frequency – pausing 7 seconds at each. Push the SCAN button once to begin tuning up scale, and press it again during a pause to stop the scanning. The display shows SCAN during scan tuning.

PROGRAMMING/RE-PROGRAMMING PRESET STATIONS
Tune in the desired radio station. Then push a PRESET selection button for 1.5 seconds. When you hear a beep, the frequency has been memorized. Repeat this procedure for the remaining preset station selectors on the FM (FM1 and FM2) and AM bands.

NOTE: The radio programming controls have triple functions. Each button can be set to one FM1, one FM2 and one AM station.

(old post by Qsilver7)