gistfile1.php

function custom_url_logo(){

    $logo   = reactor_option( 'custom_logo_media', get_template_directory_uri() . '/library/img/logo.png' );
    $logo2x = reactor_option( 'custom_logo_retina', get_template_directory_uri() . '/library/img/logo@2x.png' );
    
    if ( $logo['url'] || $logo2x['url'] ) : ?>
    <div class="logo large-2 medium-2 columns">
        <a href="<?php echo esc_url('http:Your custom URL HERE'); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home">
 
            <img data-interchange='[<?php echo $logo['url']; ?>, (default)], [<?php echo $logo2x['url']; ?>, (retina)]' alt="" class="hideie">
            <img src="<?php echo $logo['url']; ?>" alt="" class="ie">
            <noscript>
                <img src='<?php echo $logo['url']; ?>' alt='<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>'>
            </noscript>
        </a>
    </div>
    <?php endif;
}

function crum_replace_logo_url(){
    remove_action('reactor_header_inside', 'reactor_do_title_logo', 1);
    add_action('reactor_header_inside', 'custom_url_logo', 1);
}
add_action('init', 'crum_replace_logo_url', 1);