The point of the title, as I can read it, was to avoid being parsed as "how to write insightful posts." The author went off on "how to write" as a set phrase because it implied that one was about to talk about the mechanics of writing (grammar, diction, style, etc.) rather than the content. I believe this whole thing could have been fixed as thus:
"How to find insights to blog"
or even more simply:
"What to blog"
or, now that I think about it, the simplest of all, with the least change:
"How to be insightful".
Because that's what the author really wanted to show with the rest of his post—how to be an insightful person that would then have insightful things to blog.