Step 1 - Create a Satellite Link
Go into your project and navigate to the Satellites page. Create a new Satellite link and give it a name like "My Embedded Survey" to use on your website.
Step 2 - Copy The Satellite Link
Click on the "Copy to Clipboard" button to copy the Satellite Link.
The final step is inserting this link into the source of an iframe tag to use on your website. An example of the formatting would be
<iframe src='http://YOUR COPIED LINK'></iframe>. Inserting HTML into websites depends upon how you are hosting your website: I would refer to your host's documentation to determine how to insert the iframe into your site.
For quick reference, inserting HTML to Wordpress sites can be found here.