Set the alarm clock to the right time.

Literal

Alarm-clock [poss-の] ring time [obj-を] adjust [imperative-なさい].

目覚まし時計 ('alarm clock') — literally 'wake-up clock.' なる (鳴る) means 'ring/sound.' 合わせる ('adjust, set') is the verb for setting times. ~なさい is the firm imperative.