From the Manual . . .
You can store six FM-RBDS (weather stations), six FM auto store and six AM stations in memory.
Select the wave band and tune to the station.
Press Key 12 (bottom row, button farthest on the right) to activate memory mode.
The word "MEMORY" flashes in display 6 (the radio information window).
Select the slot of your choice (i.e., memory slot 1 - 6) by pressing key 3 or 4 (the right or left arrow on the round button on the handlebar).
Press key 12 again (bottom row, button farthest to the right). The station is now stored in memory.
RECALLING:
Briefly press key 3 or 4 (the right or left arrow on the round button on the handlebar). The call (sic) the station stored at the next slot or the preceding slot in memory."
HTH