You will need to raise the vehicle to gain access to the drain plug on your transaxle. Place a container underneath the plug (make sure it can hold 4 qrts of fluid). Replace the fluid with Dexron VI or equivalent ATF (please note of any metal fragments in the transmission fluid as this will indicate the level of wear). Fill to 75% capacity to account for any fluid left in the transmission. Move through all gear selections while engine is running 2 times pausing for 10 seconds between selections. Place back into park and recheck for proper fill while the engine is idling. Take it for a drive at both stop and go traffic and on expressway to ensure fluid has properly circulated. Upon retrun, Recheck again while idling in park.