Directions are provided with the switch. If missing, you can find them on Eaton's website where there is also a video. Important:

• Be sure that the fixtures or bulbs support dimming before installing the dimmers. Many LED bulbs do NOT.
• If the dimmers require neutral wires, be sure they exist inside the electrical boxes before disconnecting anything.
• Take photos of the existing switches and their wires before disconnecting anything. You want to be able to reinstall them if the dimmers don't work.