How do you get a drain plug back into the radiator?
When you open the hood you will see a plate that is above the radiator. (the hood latches is mounted on it) you will also see a bracket that is monted to the top of the gill. You will need I believe it is a #25 star bite for some of the screws. You will be able to screw the drain plug back in from the top. Good luck.
If you are looking at the radiator with the hood opened up, the drain plug is on the bottom right side (the side that your battery is on) on the back side (facing the engine) of the radiator. I just had to replace my radiator and the drain plug only takes 1/4 turn to open. (You won't need any wrenches to open the drain plug either.)