If you have installed Office 2013, you will need to activate in order to use all its features and access additional services and functionality. Activating Office 2013 is quick and easy. Lets take a look.
Launch any of the Office 2013 applications. Here I have Microsoft Word 2013 open. Click the File menu.
Under Product Information, click Change Product Key
Enter your product key for the edition which came with the suite you bought then click Install.
Click OK, you can start using all of Office 2013.