1. Turn your Apple MC374LL/A laptop over.
2. Find the laptop battery release button lock for your Apple MC374LL/A laptop.
3. Now that your Apple MC374LL/A laptop battery is unlocked, find the battery release button down.
4. Holding the laptop battery release button, gently pull your battery away from the laptop.
5. Now that your Apple MC374LL/A battery is removed, grab your replacement Apple MC374LL/A battery for installation.
6. Insert the battery into the slot. Push the Apple MC374LL/A battery towards the laptop and secure it in place.