where to get site ID

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention.

I’m not quite sure whether I fully understand your concern. But I’ll do my best, and please let me know if I misunderstood.

Do you mean how to find the post/page ID inside WordPress? If so, you can follow the steps in this link:
https://mythemeshop.com/blog/how-to-find-post-category-tag-comments-or-user-id-in-wordpress/

I hope that helps.

Thank you, and looking forward to your update.