Using the 8 Velcro strips that come with the scale, mark both sides of all four wheels as shown, removing the adhesive backing and sticking the Velcro to the mat. Make sure the Velcro strip is touching the side of the wheel where it touches the ground, straight down from the axle and going straight out. 


If it's hard to know straight down from the wheel's axle looks like, try using a plumb bob or make your own: tie a small object like a paperclip to the end of a string, then hold the top of the string and let the paperclip dangle below. Gravity will make the string straight, and you can hold it up to your wheel's axle to show where the Velcro should be placed. The next step will be placing the weighing pads on the Velcro.


Check out this video on placing the Velcro properly: