Could someone please tell me where to find bulb mode on my Nikon D3300??
Bulb is positioned on the shutter speed dial as the slowest shutter speed, way down just past the 30" second shutter speed. It is a long way down there speaking of rotation.
Because it is inconveniently so far down, and to come back up, there is also an X speed next to it. This X is the selected flash sync shutter speed, and on D3300, probably always shows as 1/200 second. So in some cases, for fast convenience, you may not need to come all the way back up. (but selected shutter speed applies only to M and S modes)
Set to Manual mode (M), rotate command dial to the left (pp. 68 and 71 of User's Manual).