Dear valued customer. First of all, I would like to thank you for your order. Please allow me to explain to you how to use this product. Before using the product, you should clean and wipe off dust in the area where the product will be attached so that the glue can work effectively. If there is dust, it will cause the glue not to be tight enough. If you wouldn't like to place a new order, I would like to suggest you reinstall it with double-sided tape. However, if you would like the experts to guide you directly on how to use it, please contact the HP call center at 1284 24 hours a day. Thank you // Admin