Remove screws from the battery area, noting the following:

These screws are on oversize clearing holes, but hold other components on the keyboard. It is not recommended to remove them yet.

Two screws secure the optical drive: one in the battery compartment and one in the RAM compartment.

With the screws removed, PUSH the optical drive out through the opening at the BLUE arrow. You will need to remove the drive to access two more screws at the edge of the frame in the opening of the optical drive.