<human>:  How can I fix my bicycle chain?
<bot>: 
1. Start by making sure the chain is in the correct position. Shift the derailleur to the smallest sprocket and check that the chain runs smoothly across all sprockets.
2. Next, determine the length of chain that you need. You can do this by counting the number of links on the old chain and subtracting two.
3. Release the chain tension by shifting the derailleur onto the smallest sprocket. Use a chain tool, or an adjustable wrench, to remove the pins that connect the two ends of the chain.
4. Find a new chain, making sure it matches the number of speeds that your bicycle has.
5. Fit the new chain by pushing the pins back together with the chain tool and run it through the rear derailleur.
6. Re-adjust the tension with the derailleur and make sure the chain is running smoothly and without any excess slack.