This is how it works. There are three names you can change for your character.
There is your Short Name (also your Captain's name) which you can only change using the Captain Rename Token which can be purchased from the C-Store for 280 points. This is the main name of your Captain.
If you go to your character screen (by pressing "U") and choose edit details you can change the First, Middle, and Last name of your character. However the Short Name is the one that is always displayed.
There is also your handle (@your name) which can be changed by contacting Cryptic. This is also the name you use on these forums.
is there a place to change your toons name? ...@ name
if it can be done for energy credits that would be even better...
cant imagine id have to even do it more than once on a toon.. but you never know with some people..
the @name should never be changed unless you misred something while signing up for the account, since its basically your "accounts nickname" meaning people who your friends with can use that to recognize who you are when your playing different Alts.