First, are you a captain?
Next, I actually will have to check on that as I haven't changed my info in so long I am not 100% sure.
I believe if you go into your Control Panel and hit edit profile midway down the page will be where you can set your rank. That may or may not change the display as I recall there being another spot that also has something to do with your Display Group. That may be in a different area pertaining to the usergroups.
Give me a little bit to find that and I will let you know. I would guess but better checking first!