How do create and setup an email account using my 365 subscription?

Click on “Your info” and then “Manage how you sign in to Microsoft.” Click on “Add email.” Enter the new email address you want to create, and follow the on-screen instructions to complete the setup process. I hope this helps ;-), let me know if this is contrary to what you need, I would still be helpful to answer more of your questions.

https://answers.microsoft.com/en-us/outlook_com/forum/all/how-do-create-and-setup-an-email-account-using-my/f8f2a959-3fc9-492d-b20f-699a6141e742