Howdy, it's me. I haven't logged in for two years, and since then I've changed my mine craft username to ZzConradzZ. I'm pretty sure my UUID is still the same, but my forum account hasn't updated and I'm prompted to make a forum account. It's good if I need to make a new account, but I'd rather keep this one.
You can update your forum username by clicking the gear in the top right, then in the right column about 4 from the bottom is “update username” Let us know if that works