Using the Deltana 3 - 1/2' x 3 - 1/2' Square Hinge is easy. First, make sure the door and the frame are clean and dry. Then, position the hinge on the door and frame, and use the #9 x 3/4' wood screws to secure it. For best results, use a screwdriver or a drill. When using, avoid applying excessive force to prevent damage. As for maintenance, regularly check the screws to make sure they're tight. If the hinge gets dirty, you can clean it with a mild soap and water solution, then dry it thoroughly. This will keep your hinge in good condition and ensure smooth operation for a long time.