Honestly the Op could do these himslef but I have no idea what skill level he has to attempt to advise him to fix it himself, He's already shown what little knowledge he has.
I'm NOT dumping on him but facts are fact.
If the Op is capable? He could
1. remove the overflow bottle and rinse it out with water along with reinstalling it.
2 Buy a flush radiator kit and flush out and refill the engine coolant
3. removed the front portion of the splash guard to make sure the coolant cap isn't lying there.
Alternative TAKE IT TO THE DEALER
That is all carry on.