Using the Thule Yepp Nexxt Maxi is easy. First, quickly mount the seat onto your bike's rear frame. Then, place your child in the seat and use the magnetic childproof safety buckle to secure them. Adjust the footrests, foot straps, and the 5 - point padded harness to fit your child properly. When it comes to maintenance, the seat's water - repellent materials make it easy to clean. Just wipe it down to keep it dry. Remember, this seat is for children between 9kg and 22kg. Don't use it for children under 9 months. If your child is under 1 year old, it's best to check with a pediatrician before using the seat.