Currently calendar feeds are assets.

1. Navigate to the page where you wish to place your legacy calendar feed asset.
   
2. Click onEdit on the page actions toolbar.
   
3. Click on the green Main Content button to check out the page
   
4. Place your text cursor in the editable region where you would like the calendar to appear.  
   
5. Click on the assets icon  (rotating arrows) to view available assets.  
   
6. Select the appropriate calendar. 
   
7. Click Insert.