In Chrome you can right-click on the button and then click inspect element. This will show you id and class of button. Then you override default styling of button.
I don't believe you can do this through the visual form editor UI. You will probably have to insert some custom CSS to align the submit button where you want vertically.
I am not sure how to move the unsubscribe box next to the text field, but if you click on the unsubscribe in the editor you can drag it back and forth.