As newbshooter says, with the display on, press the 'i' button to bring up the settings page. (If the display is off you will need to press the 'i' button twice.
The option below ISO, is AF-A and MF as you have already found.
If you select the option below this entitled AF-area mode, you can choose, single-point AF, Dynamic-area AF, Auto-area AF and 3D tracking.
Hope this helps