How do you boost a post? Went back to my old post and I'm not seeing the option on my end.
You boost a post like you upvote it. After your first upvote, all your subsequent upvotes are considered boost.
Note: that boost decays pretty fast with time since the original submission. The older the post the more upvotes (and yet even more boost) a post requires to rank higher.
I might change this in the future. Rather than using the time since the original submission I might use the average time of the upvotes and boost rather than the time of the submission.
Adding a math plugin to my markdown editor is on my todo list ... so I can show rather than tell what the ranking algo is among other things.