To open the To Do application on the Sidekick LX, first press JUMP then roll the TRACKBALLPlanning icon until you highlight the in the left-hand "ring" of applications. Press or roll the TRACKBALL right to open the second-level ring of applications, then highlight To Do. The To Do "splash" screen will appear on the right.
The splash screen lists tasks that are either due today or overdue. If you have more tasks that are due today or overdue than can fit on the splash screen, a note at the bottom of the screen tells you how many more. You can store a total of 50 taskson the Sidekick LX, including the tasks that you've discarded to the Trash.