I really love Jetpack’s Infinite Scroll module, and I have shared a tutorial dedicated to customizing Infinite Scroll module. If you have a website with tons of posts, your viewers will never reach your website’s footer, so they add a floating footer to your website.
The floating footer adds a small credit message with the link to WordPress & theme you’re using, but I’ll show how to edit Jetpack Infinite Scroll Footer.
Just add following snippet to your current theme’s functions.php file with a custom footer message:
add_filter( 'infinite_scroll_credit', 'your_jetpack_footer_text' );
function your_jetpack_footer_text() {
return '<a href="http://link_to_site">Credit Link</a>';
}
Thank will do the job!