Locate the 2 Philips screws on the back of your calculator, as outlined.

These screws are not to be confused with the 6 Torx T6 scews surrounding the calculator.

With a Philips 0 or 00 screwdriver, unscrew the two screws.

The two Philips screws will not come out of the battery door, and will stay attached. Do not attempt to remove them completely.