To add content open the snippet toolbar by clicking the arrow tab to the right of the editor. Click and drag the content snippets into the page area, then change text and images as needed.
Click the + ADD SECTION button bottom right, then choose the section layout required from the popup.
Click the bottom blue spanner, then from the popup that appears click the circle icon to add a custom colour (highlighted with arrow) or one of the default options (default, light, grey, dark)
You will need to have selected an image section to get this option. Click the bottom blue spanner, then from the popup that appears click the IMAGE button, then the select image button to browse for an image (highlighted with arrow). Clicking the Ken Burns Effect checkbox will animate the image.
Click the top-left spanner blue spanner icon, then from the popup that appears, choose the required % height, or auto to allow the content to set the height.