There are many ways to do it, one method that works well for most people, is to connect a piece of 3/8" rubber hose about 4' long to a funnel. Remove the fill plug, stick the hose in the hole, and have an assistant hold the funnel and dump fluid into it while standing next to the vehicle. When fluid runs out of the fill hole, put your thumb over the end of the hose, and put the plug back in.