Using the Randonneur Seat Post Rack is easy. First, attach the rack securely to your bike's seat post. Then, you can place your TailRider or any top - rack trunk bag on it. Make sure the bag is well - balanced and fastened properly to avoid it falling off during your ride. When it comes to maintenance, regularly check the rack's mounting points for any signs of loosening and tighten them if necessary. Keep the rack clean by wiping it with a damp cloth after rides, especially if you've been in wet or dirty conditions. Also, avoid overloading the rack as it may affect the bike's stability and the rack's durability.