It depends on the Forum that you wanna Mod; at the top of the Forum if it says "Apply to be a moderator of this forum" as a link - click on it and explain why you'd make a good Mod.
If there's no link, there's no need for a Mod for the Forum because it may not be busy/popular or there may already be enough Mods for it.
As for being a Pro - I don't know if they're still doing that anymore, but it depends on your quality of answers to questions!
Hope that clarifies things =)
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