I have rich text metabox.When I echo the out put it shows html tags.If I write <h1>Hi</h1> in editor metabox it ouput the same.My works so far

     <?php
     $valueeee2=  get_post_meta($_GET['post'], 'SMTH_METANAME_VALUE' , true ) ;
     wp_editor( htmlspecialchars_decode($valueeee2), 'mettaabox_ID_stylee', $settings =     array('textarea_name'=>'MyInputNAME',) );
     ?>

To display

$content=get_post_meta($post->ID, 'SMTH_METANAME_VALUE', true);
echo $content;