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I asked a question on Project:Support_desk/Sections/System. I've now solved my own problem, before anyone could reply.

But now, I noticed that I was about to put on my wiki (which I linked) some personal information that I don't want associated with my Wikimedia username. Would it be possible to have those revisions (of the question I asked) deleted?

Yes. Please talk to one of the admins.

Done. Next time, please just not post things here if you're not sure.