Once you are happy with your Drop and it is ready to go, save and exit the edit page. When back on the main drop view, click "Embed":
You can now preview what it will look like on an external site. Here is an example:
If you wish to preserve the design elements you added including images, and text, click the Copy button. This will copy the html block, printed above for visibility. You can then paste the iframe code in your website.
If you only want to embed the sign-up part, because you have existing branding and text elements in your website, click "Form Only". This will embed only the text entry fields for sign-up: