The objective cell must contain a formula. If you don't see it, you need to insert the Solver App. In the Excel Web App, the Solver Parameters dialog should be visible on the worksheet. If you don't see the Solver command (on the Data tab on Windows, or the Tools menu on Macintosh), you need to load the Solver Add-in. You can resize this dialog by selecting its lower right corner and dragging.
Click the Solver command to display the Solver Parameters dialog.
