I'm new to this software. How do I find my test site I'm working with when I log in. Also How do you change a theme. I really want a blank page that I can add my own fields. How do you do this?
You can find your test site in your account under Wordpress Hosting.
click on the menu on the right and select "Settings"
Then you'd go to Basic Settings and select "Staging"
As for the theme: head into your dash and click on "Appearance"
Then select theme