One option, when you can't edit an article from an IP address because it's semi-protected, is to post a comment on the talk/discussion page of that article, explaining what change you think should be made to the article, and why. Ideally you'll cite a source, particularly if there is a content dispute, but for copyediting/typos, that's not necessary, of course.
(And, as an aside - if you had succeeded in getting a new account set up, you'd still have to wait until you became "autoconfirmed" in order to edit semi-protected pages. Currently that happens four days after registration, but it looks like that is about to change, to something like seven days PLUS at least 20 edits. That's to reduce vandalism, which it certainly will, but it would be yet one more rule change that will - at least slightly - further impact new editors.)
A suggestion
One option, when you can't edit an article from an IP address because it's semi-protected, is to post a comment on the talk/discussion page of that article, explaining what change you think should be made to the article, and why. Ideally you'll cite a source, particularly if there is a content dispute, but for copyediting/typos, that's not necessary, of course.
(And, as an aside - if you had succeeded in getting a new account set up, you'd still have to wait until you became "autoconfirmed" in order to edit semi-protected pages. Currently that happens four days after registration, but it looks like that is about to change, to something like seven days PLUS at least 20 edits. That's to reduce vandalism, which it certainly will, but it would be yet one more rule change that will - at least slightly - further impact new editors.)