In order to use any component in your application, you should add a reference to it. Follow these steps (assuming you use Visual Studio .NET):

1. In Solution Explorer, expand the project node you want to add a reference to.
2. Right-click the References node for the project and select Add Reference from the shortcut menu.
3. In the Add Reference dialog box, select the .NET tab (selected by default).
4. You will see Aspose.Spell in the top pane, select it and then click the Select button.
    
5. Now you have referenced Aspose.Spell and it should appear in the Selected Components pane of the dialog box. Click OK. The Aspose.Spell reference will appear under the References node of the project.