Where to manually enter UMI# for APA citation of dissertation?

For the life of me, I can't figure out which field on the Info tab should get the UMI number. I even tried entering dummy numbers in all of the ambiguous or unfamiliar fields then generated bibliographies to see if Zotero added "UMI#" to the front of any of my entries. Nada.

I'm feeling a little dense for not being able to figure out something this basic, and I can't find other forum posts or documentation about this. So forgive me if this is a question with an obvious answer. :)
Thanks.

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