Before you can play an WMA (Windows Media Audio) file in iTunes and add it to an iPod or iPhone, you must convert the file into a playable format. As long as the WMA file does not contain digital rights management (DRM) protection, it can be imported into the iTunes program and converted into an MP3, WAV or AAC format. Once the file is added to your Macintosh computer's library, iTunes will automatically convert it to the preferred audio format found in your iTunes preferences.
Click the "iTunes" icon on your computer screen's dock, or open the Applications folder in Finder and double-click the "iTunes" icon.
Click "iTunes" at the top of the menu and select "Preferences" from the drop-down menu.
Click the "Import Settings" button and click the drop-down menu next to the "Import Using" section. Select "MP3 Encoder" and click the "OK" button.
Click "File" at the top of the menu and select "Add to Library" from the drop-down menu.
Click the WMA file you want to add, and select the "Choose" button. The iTunes application will automatically convert the file to an MP3.