Turn on your Rouge Sur Mesure device and remove the cap from each cartridge. Slide the base of the Rouge Sur Mesure device to insert the three cartridges in their chambers until they click in place. The Rouge Sur Mesure app will recognize each cartridge and initiate priming protocol. Once confirmed in-app, you may begin creating your custom lip shades. After creating your target shade, use the included retractable lip brush to thoroughly mix the dispensed formula. Use the tip of the brush to line your lips with high-impact color just as you would with a pencil. Then, glide the brush across your lips to complete the application