This is why we can’t have nice things. *sigh*
When hyphenated, twelve-step is an adjective, as in twelve-step program or whatnot, but it isn’t supposed to be an adjective in that title.
Because this is the title of an online article, and many journalists like to use numerals as much as possible in titles (and elsewhere) because they assume readers haz teh lazy and can’t be bothered to read twelve instead of 12, I’m gonna leave that part alone.
However, this is from a person claiming to be qualified to tell other writers how to edit. *shakes head* I suggest that knowing the basics of punctuation and grammar — knowing not to hyphenate 12 steps, for example — may be a good place to start.
Personally, I’d rather read an article titled “Twelve Steps to Self-Editing,”because I’d trust that writer more to know what the hell they’re talking about.