On many boards you have a rank name or a custom member title (the name a board might use varies).

But basically this is that little title often just below or above your avatar on the side of a post you make.

Now on these boards, we have the setting so that you can change the title - after just one post.

To do this, Click on My controls.

From there > Personal Profile and then > Edit Profile info.

Then in the box that appears the very first item is:
Custom member title

Now please remember - KEEP IT SHORT! If too many people persist in making them far too long we will be forced to disable the feature on the board.
We recommend no more than 5 or 6 words at a time! 3 or 4 is considered the best amount, although 8 is really your limit (depending on length of word as well of course).