The memory aid is PARE:

1. POWER to idle
2. AILERONS neutral
3. RUDDER on the floor opposite the direction of spin
4. ELEVATOR nose-down to break the stall

You will want to read the full explanation in the Pilots Operating Handbook or POH for an understanding of the steps and why you need to take them. Commit the sequence above to memory and better yet get spin training from a qualified instructor.  Credit: Aviation Stack Exchange.

Watch a test pilot test an aircraft for spin recovery.