Firstly on the back cover, remove the small sticky soft cushioning material covering the recess with the screws in it. 4 of them in total. Unscrew them.
This must separate the front cover from the board. Remove the board and turn it over to view the front side with a soft black cushion cover over a smooth shinny mesh.
Well, my TI BA II plus has a broken LCD screen which according to the customer care is not covered under the warranty. Is it possible to find a replacement LCD to replace the broken one in the calculator.