Edit Mathematical Expressions
Use the following procedure to edit an expression:
Select the expression, or partial expression, you want to change. Double-click to select the entire expression or select part of the expression by dragging the mouse over it.
Add, or change information in the expression by entering it directly or by using a palette.
When you have finished editing, press the Enter key to accept the changes.
Input Display Options, Overview of Palettes
Download Help Document