There are a few steps to replacing a front derailleur: nn1. First, remove the old derailleur. This is usually done by unscrewing the derailleur from the frame. n2. Next, attach the new derailleur to the frame. This is usually done by screwing it in place. n3. Then, connect the derailleur to the shifter. This is usually done by attaching the derailleur cable to the shifter. n4. Finally, adjust the derailleur. This is done by turning the adjustment screws on the derailleur until it is in the correct position.