The problem is that you aren't supposed to leave comments. You're supposed to leave answers.
Commenting is a privilege that only users who have attained a certain level of reputation are afforded. Until that time, you aren't supposed to have the ability to leave comments, so the UI doesn't show you the link to leave those comments. It's not unintuitive, you're just trying to do something you aren't supposed to be doing.
And leaving answers instead of comments is always the wrong move. They'll be flagged as non-answers and removed almost immediately by either a moderator or a triumvirate of 10k users. And the more times you do this, the more penalties that you'll begin to accrue, leaving eventually to your rep level decreasing (putting you further away from your ultimate goal of the ability to comment), or causing your account to be blocked from posting answers altogether.
You mention that re-creating accounts is "pretty lame", and I agree. But you should also consider that a Q&A site run by a bunch of programmers is probably smarter than to allow users to beat the system by just creating a bunch of new user accounts. Most of the bans occur at a lower level than your user account, and if you're detected/suspected of this type of fraud, someone will definitely move to instate such a low-level ban.
Really, you're not helping either yourself or the site by spamming the "answers" section with comments. Find some questions that you can actually answer and answer them. Earn a few upvotes, and pretty soon, you will be able to leave comments of your own. It's not that hard to use the site correctly, and helping yourself will go a long way towards others approaching your situation sympathetically.
To be frank, it's quite unclear at this point why we should reinstate your ability to post answers, as you don't seem to have learned anything so far.