Resetting shift accounts

So it won’t let me change my email address for battleborn tap to match my game on my ps4. I accidentally entered the wrong email address when I first logged into battleborn tap. I can’t seem to change the name to the my ps4 account email. I’ve tried to fix it through the process but it says your already a member how do I reset it or what do I need to know? Thanks in advanced

Also how do I know if it has been set if I already did it. I apologize I’m not understanding the process