To add a landing page to WordPress, follow these steps: 1. Create a new WordPress Page. 2. Download the Elementor page builder plugin. 3. In your page, choose your layout on the right sidebar and then click "Edit with Elementor". 4. Use the WYSIWYG editor to add elements to your landing page including text and images. 5. Embed a sign-up form on your page. 6. Publish your landing page by clicking "Publish". 7. Once your page is published in WordPress, you can go back and edit it with Elementor by going to your Pages, and clicking "Edit with Elementor".