I'm trying to engage the HSS feature of my Yongnuo586EX speedlight, so I can use faster shutter speeds with a wider aperture. The speedlight manual says I need to "adjust the flash sync speed to Auto FP through the camera menu." I'm not finding "auto FP" in the D3300 reference guide (but then again I am learning that there is so much more our cameras can do than the guide would suggest! We just have to sleuth out how to accomplish these things). Not finding any flash sync speed settings in the camera menu either. Am I overlooking something really obvious, or is High Speed Sync something I will need a trigger to use? Right now I'm using the speedlight either in the camera hotshoe or on a cable.