How can I remove unwanted apps, such as Chess or Address Book, from my Mac?
Select the application you would like to remove and Get Info on it, either Command + i or from the Menu File>Get Info.

At the bottom of the resulting window, in the Sharing &amp; Permissions section, change the "everyone" setting to "Read &amp; Write". You will probably have to click the lock in the lower right corner first and authenticate as an administrator.

Once the setting is change, close the Get Info window.
You should be able to move the application to the Trash without any trouble.