Make a widget to my footer

Your theme appears to be loading its “footer” via code hooked into the wp_footer action, since there is no other obvious code that would do it. Of course, this is based on the limited code you have posted.

This means that you should be able to remove and replace the footer code used by the theme.

remove_action('wp_footer','callback_for_footer');
add_action('wp_footer','callback_for_new_footer');

You will need a callback something like:

function callback_for_new_footer() { ?>
  <div class="bw-footer <?php echo isset( $class ) ? $class : ''; ?>">
    <div class="row"><?php
      // add components or remove them
      $footer_logo = Bw::get_option('footer_logo');

      if( $footer_logo ) {
        echo "<div class="footer-logo"><img src="" . esc_attr( $footer_logo ) . "" alt=""></div>";
      }

      if ( has_nav_menu( 'footer' ) ) {
        echo '<nav class="navigation-footer">';
          wp_nav_menu( array( 'theme_location' => 'footer' ) );
        echo '</nav>';
      }

      echo '<div class="footer-copy">' . Bw::esc_kses( Bw::get_option( 'footer_text' ), '' ) . '</div>';

      echo Bw::go_social( 'bw-social-uc' ); ?>
    </div>
    <div class="footer-after bw-end-label"><div class="after back-top"><i class="fa fa-angle-up"></i></div></div>
  </div><?
}

You could also add elements before or after the theme’s footer by playing with the hook priority:

add_action('wp_footer','callback_for_new_footer',5); // before (probably)
add_action('wp_footer','callback_for_new_footer',15); // after (probably)

You should be making these changes in the context of a child theme, as any other changes will be overwritten, and it is possible that in that context you could simply create a file with your desired content at templates/footer.php in the child theme and have it load. That does depend on how the parent is written of course, most importantly on whether it uses get_template_part() to load the file.

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