You will need a screwdriver.
1. Loosen the six screws securing the radiator grille (three are shown, the rest are arranged symmetrically).
2. Remove the radiator grille from the vehicle by tilting it towards you and pushing it up.
3. Install the radiator grille so that the latches on the bottom of the grille...
4.... went behind the flanging of the body (pry them out with a screwdriver). Tighten the radiator grille screws.