need to find out how to replace an leakig radiator.... help please?

 

my abs light used to come on and then the car would start jerking hard, but I was able to shut the car off and it would stop and the engine light would go off after a few miles. now the abs light dont come on and the car is not jerking anymore, but the engine light has been on since then for like two months WTF have anyone had this problem if so how to resolve it?