Well, there are several grease fittings under the car. I cannot remember them off-hand, however if you look under there, you will see little nipples.. well those are grease fittings. Pump grease in until old grease pops out [you'll see it], and if it'* really gross grease, keep pumping it until fresh stuff comes in. Also, take the old grease and put it on the frame and/or body. This will prevent rust, plus get rid of that gross rust-colour our sub-frames look like, and give it a nice black look [if you cover everything, which you probably won't have enough grease for].