Jan Dembowski on "[Theme: The Box] center align text"

@aron10197 localhost URLs can only be viewed by the person on that machine. In this case that's you on your PC. No one else can see your site. ;)

*Installs theme and tries to center footer*

Using child theme or a custom CSS plugin (which may be easier) try this CSS:

p.credits {
        text-align: center
}

That should center that whole line for you.