At preview post


I enter the widget "At Preview Post"
Where can I find the Post Id?
I’m using wordpress version 4.4.2


You can find the Post ID by inspecting your post pages with Google Inspector tool or any other Browser’s Developer tools, at the first or second line of code you’ll see the post ID or by editing the Post in wp-admin / Posts > Edit Post in the URL you will see .

Best Regards,