With the Office Store at Office.com (New!), you can add functionality with a third-party app to an Office program, and then use the app to extend features in a document. For example, you can add an app called Dictionary - Merriam to use an enhanced dictionary or an app called Wikipane to provide an easy way to access Wikipedia. To use Office.com, you need to have a Microsoft account, and be signed in with your Office program. You can insert an app by using the Apps for Office button (New!) on the Insert tab. Apps are designed for specific Office programs and only appear for them.
Click the Insert tab.