There is 6(I think) plastic pins holding that plastic cover down. Take a flat edge screw driver and pop the top of the pin up. Once it is up, the pin should just pull out.
Once you have the plastic off, there is 2 bolts on each side of the grill. Remove those bolts, and the whole grill will pull forward a little.
You should be able to reach your arm in there, and remove the electrical connector on the light. From there, just twist and pull, and the bulb will come out. When installing the new one, be careful because you can knock the metal thing inside of the lens out of place. If you do, just fish it back into place with a piece of wire.
In any event, the whole process is detailed in your owners manual.