How to manage Add-ins
Excel
2010
Some function in Excel is available only when the add-in is installed. For example, Solver or the
Analysis group is not available in standard ribbons, you need to install the add-in before you can
use it. See also Using Solver.
To install the add-in, follow next steps:
1. On the File tab, click Options:

2. In the Excel Options dialog box, select the Add-Ins tab:

3. In the Manage box, click Excel Add-Ins, and then click Go....
4. In the Add-Ins dialog box, place a check mark next to the item named Solver Add-In:

5. Click OK.