You need 1000 posts and since the accounts were merged, you should be able to make the change. Go to User CP and click on Edit Your Details under Your Profile (these appear on the left side of the page. Scroll down a little bit and you'll see Optional Information in the middle part of the page. Immediately under that is the Custom User Title box where you can enter your new title. Once you do that, scroll to the very bottom of the page and select Save Changes.
I think Tom was offered and accepted the mod job around the beginning of the year.