Some of it is in Impulse > Community > My Impulse > Account > Profile ......can change sex
Impulse > Community > My Impulse > Account > LogIn ......... can change Usernameand/or Password.
Impulse > Community > My Impulse > Account > Images..... click the word "forums" then the new loaded page allows you to change your Avatar, Personal Image and/or Desktop Image. Then press Options tab to set some account options and also Mailing List options too, The Registration tab is next in line with downloads for your purchases.
I can't find where to change the Honorific either and how to delete a skin from the gallery also is beyond me.