Edit in JSFiddle

$(window).load(function() {

    var likes = parseInt($('.BS_count')[0].textContent.split(' gostam')[0]);
    var popular = 5;

    if( likes > popular ) {
        $('.entry-content:first').prepend('<div style="max-width:70px;float:right;text-align:center"><img src="http://imgur.com/hds8Nup.png"><br>POPULAR</div>');
    }
});