How can you program a TI-83 Plus to find area under a curve?

To program a TI-83 Plus to find the area under a curve, you can use the built-in integration functionality. Start by entering the function you want to integrate using the Y= menu. Then, create a new program by accessing the PRGM menu, selecting NEW, and entering your program name. In the program, use the fnInt command to calculate the integral, specifying the function, variable, lower limit, and upper limit. Finally, display the result using the Disp command.