You can go to the program page by clicking in the "Program" field when it is showing (i.e. when you are in program mode). You may edit the program by typing in or deleting program steps. You may also use Cmd-X (Cut), Cmd-C (Copy) and Cmd-V (paste). Be sure that you do not leave any blank lines within the program list; the program will stop at the first blank line it encounters and reset to the start. Note that the number key entries are entered in the program as '1, '2, '3, and so on. The program can be erased with the [ClP] key only while in the program mode.
Click in the return arrow to go back to the calculator from the program page. The program mode is turned off after returning.
You can leave a couple of blank lines after the program and then put in instructions for using it. A program called "Quadratic Roots" that shows this was left in the calculator when it was distributed. You can save the program as noted below.