This isn't a tweak - more like a guide on how to use Blogger's new 'Edit HTML' box to make tweaks to your blog. I'll get to the point. Most of the times, you do not care what's in the box. You go there when a tutorial sheet requires you to do so, and almost always, you'd use the Search Function in your browser (invoked by hitting Ctrl + F on your keyboard) to look for whatever it is you're looking for.
But with the new editor, you won't see the result that you want to see with this old way of doing things. The tweak is to..