Note: While on a trial, you won't be able to embed content. This is for security reasons. Once your Simplero account is active, the option will appear.
You can embed content in a content box in most places across Simplero: Email body, body content in a course, the text box on a landing or site page.
You can do this in the WYSIWYG editor.
When adding a script on a Site or Landing Page, you'll be able to add a Script section instead of using the WYSIWYG editor.
Note: It might not always work, because the embed code might interfere with some of the code on Simplero, or other weird stuff, so try it out.