As against the instructions being in English, I can detail here the way forward for Francophones:
STEP 1: Clean the screen with the wet wipe (packaging marked 1) and dry wipe (packaging marked 2)
STEP 2: Peel off the electrostatic blue film and lay it horizontally on one side of your screen. Remove to remove dirt imperceptible to the naked eye and repeat 2 or 3 times over the entire area of your screen.
STEP 3: Enter the tempered glass, take off the protective film (! Use the two small sticky labels package to handle the glass without leaving fingerprints), place the glass on top of your screen by aligning well opening before the speaker output of the sensor top and front camera. Ask the glass gently on your screen, tap the middle finger and magic! Your screen is protected!
