Make sure that the car clips are located at the end of the attachment straps. 2. Take the loop end of the attachment strap and pass it through the backside of the clip. 3. Grab the other end of the strap and pass it through the loop. 4. Pull the strap tight until it closes around the clip. 5. Align the side buckles with the doorframes of the vehicle. For a four-door vehicle, one strap must be attached to the door frame. For a two-door vehicle, you'll have to move the carrier forward a little bit and attach 2 straps to the door frames in each of the two doors. 6. Ensure that the clips are turned towards the carrier and connect the strap to the corner buckle by threading it through the middle slot of the buckle. Bring it back down through the front slot. 7. Open the doors and hook the car clips under the door frame.