Change My User Name for cox user forms

Hello I need help i just Joined this form and i made a mistake when i signed up for this form it asked me for a user name and i put COX Contuor Update and that is the question i wanted to ask  insted it is now my User Name is cox contor gudie  for the forms in thire a way to change it if thire is i would like My User Name to Be MattHandy8577 Thank You Very Mutch