Just as someone else said, the easiest way to do this is be very active on said forum. I was on a forum for a few years, disappeared, and within a few months of being back I was made a moderator. Now I am a “global moderator” meaning I am able to moderate all subforums of the board and ban members,etc etc. Good luck on doing this, it can be fun but can also be stressful.
People doing this are also doing these things:
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The easiest way to become a moderator is be proactive in your community and be there A LOT. People want somebody everyone knows to be a moderator.

