Under the hood there are two round caps with a square "female" socket on top of them. The tool to remove these caps is in your toolkit. One is located just forward of the ABS unit on the passenger side and the other is under the air duct leading to the air box, just forward of the red battery connector. Get a slim funnel and 6 gallons of DEF and carefully top them off. The message will go away. I let mine get to under 100 miles and just barely fit the 6 galllons.