Leadpages | WordPress.org

I am trying to get a leadPages to come up once a person goes to a particular page. I can make the contextual link show up when I click on the link icon. But I want the lead page to show up instead. When I go to appearance, menu, click on page which has my menu. Then go to custom link that has my landing page publishing domain. Nothing happens. Can someone tell me how to make my lead page show up when someone clicks on the page?

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