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If you want to use the most basic function of your mini Aqua One filter pump, do not attach the upright adapter. Simply insert either the 9mm or the 13mm outlet into the pump outlet near the middle of your filter.
The duckbill is a spout-shaped device that returns filtered water along the surface of the water; the spray bar returns it in small streams from multiple sources spread out along the spray bar.
If you are using your mini Aqua One filter pump as the sole filter in your aquarium, use either the duckbill or the spray bar outlets to agitate the water's surface.
Determine the proper flow intensity on your mini Aqua One filter pump by trying a few settings. If your fish are small, use a low to moderate setting, but bigger fish will be able to navigate through a stronger stream.