Undo and Redo
To undo the previous action(s), click on the Undo button 
To redo actions, click on the Redo button 
OR
Click on the Edit menu and select Undo or Redo
Use the Undo/Redo drop down arrows to selectively undo/redo actions
It is possible to undo up to the last 16 actions.
Why bother trying to find it again later? Just bookmark it.
