To use any flashlight on your bike 

• First, remove the support.
• Then, slide the top and middle parts together — use glue for extra stability.
• Place the connected part on top of your handlebar.
• Secure it by screwing the screws through the connected part and the bottom part to tighten everything. (thread into the plastic)
• Finally, attach your flashlight on top and fasten it using two rubber bands.

Important: Use this mount with the flashlight only on private or non-public roads. 

If you plan to ride on public roads, please make sure to check your local regulations beforehand.

if you are creative maybe there are other objects you can use instead of a flashlight ;)