Hi Abdullah,
In this issue, you need to change/update the domain search action URL with your WHMCS domain search URL. Please check out the screenshot as a reference http://prntscr.com/ovj91n
Moreover, please create your own topic without post a reply in someone else created posts. Because the post creator can feel bothered for getting unexpected notifications of every reply of his/her created post.
Best Regards,
ThemeLooks Support Team