For the footer change, pls change the footer.php at line number 63 which reads like to –
' . __('Go Top', 'mo_theme') . ''; ?>
You will need to modify the href attribute above of course. You can create a new footer.php in your child theme as well to make this change.
Further, to prevent scrolling to the top, you will need to comment out this part in js/main.js file –
// Animate the scroll to top
$('#go-to-top').click(function (event) {
event.preventDefault();
$('html, body').animate({scrollTop: 0}, 600);
});