It is a Parking lightbulb which is amber in color, there are too many wires to just unscrew it.

try Reading owners manual

The socket for the bulb will come out of the lamp assembly with a half twist. If you cannot reach it, you may need to remove the headlamp. Most Ford is have 2-3 pins that hold the lamp in. They look like tent stakes (flat metal with the top end bent 90 degrees). Pull up on these pins, they shold slide out and them the lamp assembly can be pulled forward enough to change the bulb. Good Luck