Nikon D90 Manuals page 14

LEFT SIDE OF THE CAMERA
Flash Button: Press this button to release the pop-up flash (in P, S, A or M
exposure modes). You can also use it to change the flash mode as well as
increase or decrease the power of the flash.
Bracketing Button: Press this button to access the bracketing settings.
Autofocus/Manual Focus Switch: Use this switch to choose between auto-
focus and manual focus.
Connector Covers: Open these covers to access the following connection ports.
Visual Tour xiii