The formula bar is a panel at the top of regular report window shown below the ribbon. The formula bar is used to enter or edit values and formulas in cells.
The bar shows a constant or formula stored in active cell:
To set or edit active cell value or formula, place the cursor to the formula bar and define a new value or formula. When entering a formula, put the equality sign (=) at the beginning of it. When editing a formula, addresses of the used cells are highlighted with different colors. A cell address color corresponds to the cell color in the working area:
To undo value/formula changes, click the 
Undo button or press the ESC key.
To save value changes and calculate the formula, click the 
Accept button or press the ENTER key.
To open the function wizard, click the 
Insert Function button or press SHIFT+F3.
To set up displaying or hiding formula bar, select or deselect elements by selecting the View > Show > Formula Bar main menu item. The checkbox is selected by default, and the formula bar is displayed.
See also: