Using the KEO CLASSIC 3 pedals is easy. First, adjust the tension according to your preference. For beginners, start with a lower tension. As you get more used to it, you can increase the tension. When clipping in, just place your cycling shoe on the pedal and press down until you hear a click. To clip out, simply twist your foot. When it comes to maintenance, regularly clean the pedals with a soft cloth to remove dirt and grime. Check the tension adjustment mechanism occasionally to make sure it's working smoothly. And remember, always wear proper cycling shoes when using these pedals for the best performance.