Using the Thule Yepp Nexxt 2 Maxi child bike seat is a breeze. First, check that your bike is suitable for the seat's innovative mounting system. You can mount it on most bikes without a bike rack. Then, place your child in the seat and use the magnetic safety buckle to secure them. Make sure the 5 - point safety harness is properly fastened. When it comes to weight and height, ensure your child doesn't exceed 22kg or 110cm. As for maintenance, clean the seat regularly with a mild soap and water. Avoid using harsh chemicals. Check the mounting parts and safety buckle frequently for any signs of wear and tear. If you notice any issues, don't use the seat and contact Thule for assistance.