Not for that specific car, but the general idea in Toyota units is to hold down the Tune and the Radio button (or another combination of two buttons, methinks 'Scan' maybe an alternative) until you get the three bars/dashes in the display, then use the station preset button under each dash and push each one in turn until the number you want is displayed. Then its either good to go, or you push the Scan button again and its locked in.
Whose car did you boost the radio/cd player from ???!!!!