Using the Merida eOne Forty 400 is a breeze. Just turn on the bike and start pedaling. The Shimano EP8 motor will automatically assist you, and you can adjust the level of assistance through your phone. When going downhill, use the responsive handling to navigate curves and obstacles. For uphill climbs, rely on the powerful motor's torque. As for maintenance, keep the bike clean after each ride, especially the chain and brakes. Check the tire pressure regularly to ensure maximum traction. The battery should be charged after each use, and avoid over - discharging it. Store the bike in a dry place to prevent the frame and components from rusting. If you notice any unusual noises or issues, it's best to have a professional bike mechanic take a look.