In version 1.5.2 of this free plugin, we added a new feature that lets you add a link to the popup in the navigation menu. You can now add a custom menu item and set the popup for this menu item. When you click on this menu item, a pop-up window will appear.
To set this up, go to the appearance and then the menus. Here, add a custom link to the menu and check the “CF7 Popup Trigger” box for this menu item.