Hi kars
You can open the file: /templates/ja_blockk/html/layouts/joomla/content/video_play.php
Look for the function of youtube player and add rel parameter as below:
function javideoPlay() {
player = new YT.Player('videoplayer', {
height: '390',
width: '640',
videoId: '<?php echo $vid; ?>',
playerVars: {rel: 0},
events: {
'onReady': onPlayerReady,
'onStateChange': onPlayerStateChange
}
});
}