linkup page on form action wordpress

Example of website : https://www.shaadi.com/

My website :https://pakshaadi.pk/

Wordpress itself does not have an option for this. But there are numerous plugin and possibilities.

You obviously use Elementor as a page builder. There is a popup function there. It is described here: https://elementor.com/help/how-do-i-create-my-first-popup/

If you have further questions, I would recommend you to contact the Elementor support forum: https://www.ads-software.com/support/plugin/elementor/