Or when you're on any screen ( as long as it isn't NAVI ) and you see the blue and gray coloured interface (same interface as browsing the SD card), you can press the top left corner of the screen and it'll take you to a "home" page with 2 rows of icons.
Just pick BT from there. I find this easier than to go through the SRC button.
Just pick BT from there. I find this easier than to go through the SRC button.