At what point do I submit my personal impact statement?

My package was submitted 30 Nov 17, and I have my first appointment with the VA on 16 Jan 18. My PEBLO is pretty terrible at responding to questions via email and phone (I'm at a remote duty station), so she's never responded to me when I've asked at what point I submit my personal impact statement, and to whom. Can anyone else advise?? Thanks
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