Add them to the account form first, then select “Register form” in the field. If you did that already, please share WP Admin credentials and we will take a look at the issue.
Open the page and change the template to choose from the templates available from the theme. Maybe yours has a full width template that can be used on the page.
The built in option is to visit the UsersWP -> Profile settings and remove the tabs, then add them back in the order you want. Are you looking for something beyond that?