The Anchor strap connects to the window/door frame, the internal grab handle of the vehicle, or to the roof pole of an open safari vehicle.  The Anchor strap has 2 strips of Velcro and 2 D-rings to safely secure it.
Secure the anchor strap to the middle/back section of the door frame, by lashing it twice around the frame. Ensure that the Adjustor cambuckle faces inwards towards you. Pass the strap through the D-rings, and then return it back on itself through 1 D-ring. Pull it tight. Position so that the D-rings are on the side of the doorframe, out of the way of the window glass, and then adhere the 2 velcro strips together. The Anchor strap can remain in position for the duration of your trip