To delete programs on your calculator, first press and [MEM]. A menu should appear and scroll down to 2:Mem Mgmt/Del.... 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 . A menu should appear asking you whether you want to delete this program? Choose "Yes" if you want to delete, and "No" if you don't. This method is a lot safer than the TI-83 method because it ask you if you're sure you want to delete the program. This way, you don't make any mistakes like your hand slipping or something.