To delete programs on your calculator, first press and [MEM]. A menu should appear and scroll down to 2:Delete. Next, scroll down to 7:Prgm. Now, a list of all the programs on your calculator should appear. Just press until you get to the program you want to delete. Once the arrow is pointing at the program you want to delete, press and your program is deleted. Make sure that you selected the right one because once you've pressed , it's gone.