When you embed a form, by default it does not display the introductory text and disclaimer you set when creating the form. This is so that the embedded form integrates more seamlessly in your website.
However, if you would like to embed the form with its introductory text and disclaimer, go to your form's settings page and under 'Embed' flick the switch marked 'Include Text & Disclaimer'.
The text should show up on the website your form is embedded on shortly. You may need to refresh the page to see it.