It explains the method of adding the widget to the footer. 
フッターにウィジェットを追加できるようにカスタマイズを行います。
functions.phpの関数を書き換えます。
180行目くらい
function raindrops_widgets_init() {
        register_sidebar(array (
          ‘name’ => __(‘Default Sidebar’),
          ‘id’ => ‘sidebar-1’,
          ‘before_widget’ => ‘<li class="widget default">’,
          ‘after_widget’ => ‘</li>
        ‘,
          ‘before_title’ => ‘<h2 class="widgettitle default h2">’,
          ‘after_title’ => ‘</h2>
        ‘,
          ‘widget_id’ => ‘default’,
          ‘widget_name’ => ‘default’,
          ‘text’ => "1"));
        register_sidebar(
          array (
          ‘name’ => __(‘Extra Sidebar’),
          ‘id’ => ‘sidebar-2’,
          ‘before_widget’ => ‘<li class="widget extra">’,
          ‘after_widget’ => ‘</li>
        ‘,
          ‘before_title’ => ‘<h2 class="widgettitle extra h2">’,
          ‘after_title’ => ‘</h2>
        ‘,
          ‘widget_id’ => ‘extra’,
          ‘widget_name’ => ‘extra’,
          ‘text’ => "2"));
        register_sidebar(
          array (
          ‘name’ => __(‘Sticky Widget’),
          ‘id’ => ‘sidebar-3’,
          ‘before_widget’ => ‘<li class="widget sticky-widget">’,
          ‘after_widget’ => ‘</li>’,
          ‘before_title’ => ‘<h2 class="widgettitle home-top-content h2">’,
          ‘after_title’ => ‘</h2>’,
          ‘widget_id’ => ‘toppage2’,
          ‘widget_name’ => ‘toppage2’,
          ‘text’ => "3"));
        register_sidebar(
          array (
          ‘name’ => __(‘Footer Widget’),
          ‘id’ => ‘sidebar-4’,
          ‘before_widget’ => ‘<li class="widget footer-widget">’,
          ‘after_widget’ => ‘</li>’,
          ‘before_title’ => ‘<h2 class="widgettitle footer-content h2">’,
          ‘after_title’ => ‘</h2>’,
          ‘widget_id’ => ‘toppage1’,
          ‘widget_name’ => ‘toppage1’,
          ‘text’ => "4")
          );
    }
[/php]