Solution 21710: Using Undo and Redo on the TI-Nspire™ Family.
How do I use the undo and redo functions on the TI-Nspire family handhelds or computer software?To use the undo and redo functions on the TI-Nspire family handhelds or computer software, please use the steps outlined below.
• Press [ctrl] [Z] to remove the last function performed.
• Press [ctrl] [Y] to replace the last function removed.
Available memory limitations apply to the amount of undo and redo steps that can be recalled.
Please see the TI-Nspire and the TI-Nspire CAS guidebooks for additional information. For the computer software please see the help files which can be found by pressing F1 on your keyboard while you have the software open.