how can i use custom field in query post

Your meta_query needs to be a nested array, like so;

$args = array(
    'posts_per_page' => '5',
    'cat' => '3',
    'orderby' => 'rand',
    'meta_query' => array(

        array(
            'key' => 'Featured List',
            'value' => 'Yes'        
        )
    )
);

And I get the feeling you don’t actually need a LIKE match – this’ll perform a loose comparison, and isn’t as efficient as an exact match.