The D3D dialog is in:

menu Scripts / Partners / Dimension3D / Render FireFly

I don't know where saved settings are. Perhaps look around where Poser preferences are kept and something will jump out at you.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)