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I am not necessarily looking to do this right now, but I don't see how to offer a bounty on my question or another person's question. For future readers, I am currently at 636, so I should be fine as far as having enough rep.
You click on "start a bounty" on an eligible question. From the bounty FAQ on MSO: "A bounty can be started on a question two days after the question was asked."
As of this posting, your only unanswered question is 1 day old, and not eligible yet.