Menu | <<<< | >>>> | Select the target cells for the solver with button 2

The ‘change’ cells that have been selected are colored green and their addresses are written in green at the bottom of the model sheet.  Button 1 has been deleted automatically after the configuration selections for the ‘change’ cells have been completed.  Next, when the [2. Select formulas (now yellow) to drive to zero] button is clicked, a menu appears.  You just use the mouse to select target cells.  You can ctrl-click to select non-adjacent cells.  When the selection is made click the [OK] button to continue the configuration process.