Texas Instruments TI-83 PLUS - Manual (Page 505)

TI-83 Plus Programming 502
You can increase available memory in one of two ways. You can delete
one or more programs or you can archive some programs.
To increase available memory by deleting a specific program:
1. Press y L and then select 2:Mem Mgmt/Del from the
MEMORY
menu.
2. Select 7:Prgm to display the PRGM editor (Chapter 18).
3. Press } and † to move the selection cursor ( 4 ) next to the program
you want to delete, and then press { . The program is deleted from
memory.
Note: You will receive a message asking you to confirm this delete action.
Select
2:yes to continue.
To leave the PRGM editor screen without deleting anything, press
y 5 , which displays the home screen.