Reply To: Frontier Theme More Tag Help

That works just fine on my tests.
Make sure you’re using an apostrophe(‘) instead of a backquote(`)

<?php the_content('<span class="Read_More">There’s still more. Click here to continue reading…</span>'); ?>

But why not just use this function and modify the funtions.php instead of the 2 other php files

#Modify_The_Read_More_Link_Text

function modify_read_more_link() {
    return '<a class="more-link" href="' . get_permalink() . '">There\'s still more. Click here to continue reading...</a>';
}
add_filter( 'the_content_more_link', 'modify_read_more_link' );