Follow these steps
Step 1: In the form editor, click on Publish and select Embed on your website. Copy the embed code to by clicking on the green copy button
Step 2: Access your WordPress.org site (http://yoursite.com/wp-admin/). You must be an Admin, Editor or Author to add a form to your site.
Step 3: Create a new post and paste your embed code.
From the WordPress dashboard, click on Posts > Add New.
Step 5: Preview and Publish
Now it’s time to preview your page. I bet it looks great! So long as you’re happy with it, go ahead and publish it!