An iframe is a HTML element that places another HTML document inside a page.
You will need some HTML knowledge to use iframes.
You can integrate the first step of stage's booking process into your site using an iframe by adding a HTML code similar to the one below to your website:
<iframe src="https://YOUR_ACCOUNT.stagehq.com/events/EVENT_ID/external" marginheight="5" marginwidth="5" frameborder="0" scrolling="auto" height="250" width="500"> </iframe>
You will find the exact code for your event in your event's details part on the administration website.
If you need to change iframe's height and weight, simply change the properties with that name in the HTML snippet.