How do you use a chain tool to repair a bicycle chain?

To repair a bicycle chain using a chain tool, first, align the chain tool with a chain link pin. Then, turn the handle of the chain tool to push the pin out of the link. Next, remove the damaged link and reattach the chain by aligning the links and using the chain tool to push the pin back in place. Finally, check that the link is securely attached before riding the bike.