In your Knak account , go to the Landing Page and then Publish > Download HTML for Marketing Cloud.

Open the file and open the source of the code (right click on the page and click open source).

Select all the code (Command + a on Mac and Control + a on a PC) and copy it.

Log into SFMC. From there, Click on Web Studio and select Cloudpages.

Click on a collection or create a new collection (click on Create Collection) and open it.

On the next page, click the Create button and select landing page.

Enter a name and a description and click Next.

Select the blank layout and click Create.

Remove all the code on the left hand side and paste in the code that you copied from the landing page HTML. The landing page should show in the preview screen.

Click Save. The landing page will be able to be accessed under the Collection.