I am on this part Improve of Your Classic App by Moving It to Lightning Experience:
Evaluate Your Org's Readiness and Enable Lightning Experience. I am suppose to find Randy Realtor in my Users setting but there is only my name. I tried creating him but I know it's not working. I don't know how to complete this part of the project and move forward.

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? 

I am on this part Improve of Your Classic App by Moving It to Lightning Experience:
Evaluate Your Org's Readiness and Enable Lightning Experience. I am suppose to find Randy Realtor in my Users setting but there is only my name. I tried creating him but I know it's not working. I don't know how to complete this part of the project and move forward.