Start by putting approximately 3/4 of the anti-freeze in slowly. Use pre-mix or you will need to make sure you add in a 50/50 ratio. Once to that point let it sit for awhile and then start it, let the motor idle, turn on the heater to HOT, watch the level in the radiator as it will expand when warm. Gradually add the rest of the anti-freeze to top to the bottom of the radiator cap and then replace the cap. Now add the anti-freeze into the Burp/overflow tank to the cold level. Let the car warm completely and drive it around the block. Let the car cool completely and then check for the level in the burp/overflow tank. If low add to the cold line. I would then check for the next few times you drive and if it stays at the cold line when it has sat overnight you should be fine.