In order to ride safely, it important to safely tighten the seatpost.
Step 1: Release the clamp.
Step 2: Tighten the bolt.
Step 3: Tighten the clamp again.
If the seat post is still not 100% thigten, please repeat step 1,2 and 3 again.
Note: Each time you repeat step 1,2 and 3 you will be even to tighten the screw even more.