To adjust the limit screws on a derailleur, you will need to turn them using a screwdriver. The low limit screw is responsible for setting the position of the derailleur when the chain is on the smallest chainring, while the high limit screw adjusts the position when the chain is on the largest chainring. Start by shifting to the smallest chainring and turn the low limit screw until the derailleur is aligned with the chain. Repeat the process with the high limit screw on the largest chainring.