Changing radiator fluid... need help?

how much radiator fluid/water mixture do you need to fill the car... like roughly... i know it needs to be full... but around how much is that usually... i have a 4 cylinder engine if that makes a difference..... sorry for sounding stupid... idk what im doing... im only 17 and i live on my own and dont have the money to pay a proChanging radiator fluid... need help?If you completely drained it, you will want to get 2 gallons of a 50/50 mix. Fill it to the top and let the air work out a little bit. It will gurgle. Then fill it some more. When it doesn't gurgle any more, start the car and let it get hot. Then turn on the heater and wait for it to blow hot. Then check the level again and top off as necessary.