It should just appear in your instruments list with your other soft synths - though remember that Logic's synths appear in a different submenu to AudioUnit Instruments. You basically just need to make a new instrument channel, then on the left click the 'Instrument' button and scroll down to 'AU instruments'.
You can also choose from a range of different output configurations - stereo out will do for now, later on you'll probably want to use multiple outputs for processing different pads and engines outside of Geist.
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