How to Install: The sport bands is easy to install or remove with the pins. First, turn over and insert one side of the pin into the notch on the watch. Second, be sure to keep the band and watch at 90° angle. Third, Pressing the pull-rod inward, slide the other end of the band into place. Fourth, Sway the both of bands to make sure they are firmly. Well you can wear it. Customer Service: If for any reason you are not satisfied with the product, please contact us. We take full responsibility and responsibility for the quality of our products and will do our best to solve your problem quickly and efficiently! How to contact us: - Way one: On this page, click on "RuenTech" next to "Sold by", then click on "Ask a question" on the right top of page.br> - Way two: Log in your amazon account > choose "Your orders" > find the order ID > click "Contact seller".