I have researched on fourm and found few things,
1. Admin Panel >> Content Boxes > Add a Box >Box Type - Smarty >Position - Header Banner
{literal}
Put your js google code here
{/literal}
2. Admin Panel >> Content Boxes > Add a Box > Box Type - HTML >Header Banner
3. or With Banners Plugin? (I have banners plugin)
I wanted to show the google ads on header banner & sidebar like our demo site.