Traduction de l’étape 3
There are two RAM slots. Release the RAM by pushing the white outer tabs. Then pull the RAM straight out.
Place new RAM in slots and press with both thumbs on each end till you feel them seat.
Replace the access panel. Turn it over and plug it in. Boot the machine up and click the Apple logo in the menu bar and then go to "about this Mac", to check to see that the RAM is being recognised properly.