1. Pass the chain through the front derailleur and hang it on the smallest sprocket.
2. Hang the chain on the smallest wheel.
3. Hang the chain on the rear guide wheel.
4. Hang the chain on the pulled out rear guide wheel.
5. Tighten the chain, but do not make it too long after pulling it out (the smaller the better), and do not drop it.
6. Without falling off, count four nodes starting from the node aligned with or close to the street of the chain. The fourth node is the place that needs to be cut off.
7. Clamp the chain to the connector, and then use the connector to cut the chain.
8. Connect the two ends of the chain together.
9. Use a chain cutter to press the chain nodes into the chain.
10. Press the node into the chain so that the outside of the node is parallel to the outside of the chain and there should be no protrusions.