You can find Mosspaper's Widget here: https://app.mosspaper.com/d/#/widget. There are 2 sizes available for you to embed into your web site.
1) Log Into your Moonfruit account. If you have an account, you can sign up here.
2) Select the page you would like to display the widget.
3) Click on insert.
4) Click on "html snippet".
5) Click on the "html snippet" box. You will see an editor. In the info tab, insert the width and height of the widget.
6) Select the "setup" tab. Copy and paste the iframe code. Click "Apply".