Don't bother, they have the right to use any work you create to promote thier product without your permission and without giving you credit. They did exactly this with me several years ago and then closed my account when I complained effectively stealing £200 which i had in my cornucopia 3d account.
I will never deal with them ever again and wouldn't piss on them if they were on fire, in fact I wouldn't give them the steam off my piss!