For emails, After we send you the template to preview, you will have the option to download it. Once you download the HTML file, copy and paste that beautiful code right into the HTML Source tab in a new Marketo email. Done deal.
For landing pages, you download a copy of the html of your customized landing page template. Then in Marketo you create a new guided landing page template and upload the HTML file into Marketo. Approve the template and you’re done.