Note: place creation is a large burden on iNaturalist, please see the warnings at https://www.inaturalist.org/places/new
Since iNaturalist removed the ability to draw a new place (see details in this post), here is a tutorial for drawing a shape in Google MyMaps, which can be imported into iNaturalist.
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click CREATE A NEW MAP and zoom to your area of interest, here I’m drawing a place for the New York State Fairgrounds
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choose Draw a line->Add line or shape
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outline your area, clicking the first point again to complete the polygon, then give it a name and save it
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click the three vertical dots next to your layer name, then Export data->KML/KMZ
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choose KML rather than KMZ, then Download
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to upload your kml, go to https://www.inaturalist.org/places/new – it may take a few hours for iNat to fully process your place