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Are you sure it's a 5 thread?
I looked at the threading diagram on the 804 and it appeared to be a 4 thread. It looked like an overlock with a safety stitch in the center.
The 5 thread looked like the number was an 814
Most likely. Most overlockers can make a rolled hem. You will probably want to do a lot of practicing on scrap chiffon before trying it on the real thing. It involves using only one needle, both loopers, and making appropriate adjustments to the machine.
Perhaps the manual would be helpful. If you are having problems seeing the pictures, you can enlarge them on the computer and perhaps that will help. Perhaps you can take it to a Juki dealer and ask them to show you.
There are quite a few pictures of threading diagrams on the internet. Just perform a search for the make + model + the word "threading."
Be sure to follow the threading order specified in your owner's manual. If the order is not followed accurately, the machine will most likely not work properly. Also, be sure to RAISE the presser foot BEFORE threading. While threading each thread, grasp the thread with one hand between the thread tree and the tension disk and grasp the thread below the tension disk with the other hand and gently tug the thread to make sure it has seated in the tension disk. With most sergers, the lower looper thread MUST drape over the top of the upper looper in its final threading process Before being pulled under the presser foot.
If any either looper thread breaks or comes unthreaded, it is the best advice to unthread all the looper threads and re-thread from the BEGINNING. Just bite the bullet and do it. It will save a lot of frustration.