I'm confused - you have 1 post...you couldn't post if you hadn't activated your account. And looking at your account, being a Greenlighter, you are good to go so it must have come.
For anyone else facing a similar problem, I'll point them back to the Original Post of this thread with a link to have activation resent to you. And, I'll remind folks to check the email doesn't get diverted to a SPAM folder.