Select Menu > Apps. (or Organiser) > Alarm clock.
Alarm: To set alarm on or off.
Alarm time: To set time of the alarm within 24 hours. If your device is switched off when an alarm is due, your device switches itself on and starts sounding the alarm tone.
Repeat: To select will the alarm be repeated on selected days.
Repeat days: To select on which days the alarm will be repeated. This option is only visible if Repeat is set to on.
Alarm tone: To select alarm tone.
Snooze time-out: To select snooze time between 2 and 59 mins.