Hi,
My name is Angel. I am an Independent Advisor. Thank you for posting in Microsoft Community.
You can use the password of the new account that you create, just remember that you need to use the Computer name of you device to connect using Remote desktop:
Example
user: MYPC0001\newuser
password: ***********
Hope the information provided is useful. If the issue persists, reply here and we will be glad to help you.
Angel.