Doesn’t come with instructions, but don’t overthink it. Use painters tape to tape the lip in its position after using the short silver screws to connect the 3 pieces. Then use the black longer pointed screws and drill in the indicated spots in the bottom of the lip into the bumper. They give you nuts and bolts to use as well, I think maybe to install it more securely if you wish. Anyway, be careful when you install, the black gloss scratches easily. Looks mean and add an aggressive look to the front.
