Daniel,
I'm sure you'll be receiving explicit answers to your
question, but let me offer this in the meantime.
I don't have access to that particular camera and I'm
only guessing, but check the mode selector for a "B".
This is the retro symbol for "timed exposure" when the
air "bulb" was the commonly used remote shutter
release. Still available if you shop a bit. 
You are, of course, right to acquire a substantial
tripod and a remote shutter release.
The water fall ribbon effect may not require the
exposure time are perhaps assuming. I've used 100ISO
film (and slower) almost exclusively, which lends
itself to such work. 
I have stacked 2 polarizing filters a couple times and
used an AE camera setting. Work with the polarizing
angle of each filter until the scene is substantially
darkened. Check meter for its reaction and if the
meter has no objection, bracket a few frames and plan
on some interesting images.
Enjoy!

Jack 
  

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