Uh oh. We’ve done it again. If too many people comment on a thread it will go “on fire”. There’s an icon showing it’s popular right now. The problem is that if you’re not confirmed as a real person you can’t comment on it anymore, even it is your own thread. This was started to reduce spamming accounts years ago.
I forget the process to get confirmed but remember it was simple to do. Check your profile page.
Then you will get a little check mark beside your name in the forums. It helps to weed out trolls.