From the flatplan overview screen select 'Auto Publish Options'
Then select ‘Get Digital Link’.
This button will bring up a box of code that looks like this:
You can copy & paste this code straight into your website. It will also give you an icon of the front cover of your publication that displays on your website. The icon size will be 100px x 100px (you can find this in the code above, 3rd line down). If you want the publication to appear bigger or smaller on your website, you can simply edit the sizes from 100px to whatever size suits your requirements.