How to insert an advertising post (Popunder or clickunder) on your site under certain buttons?

Question

contextual advertising

Hello, I made my own website, but I want to monetize it. To do this, you need to do this: after passing the captcha, the user clicks on the button, how to make it jump to the advertisement and what are the platforms for this? (Popunder), and then after receiving the link, the user clicks on another button that leads to another advertising and to the original site. In general, as a link shortener.