Hello - I am trying to link Heroku to my developer Org within sales force for Heroku connect trailhead.  Can you assist me in reseting my password for mpolick@brave-moose-450514.com? I don't believe I had the opportunity to answer the "born in city" question, hence, I am unable to reset.  

I am currently taking the course Admin Trail Begginer: Getting Started With the Platform, when I proceed to sign up for a DE account I get the following message: "Sorry, we can't enroll you in a Salesforce Developer Edition account because the email address you entered is already in use. To sign up with a different email address, go to https://developer.salesforce.com/form/signup/freetrial.jsp ."

Does this mean I already have a Development Edition Account? If so where would I access it? 
Or should/can I sign up with any email adress fir a DE?