Image Blocks: Select or import an image through drag and drop
Drag an image block to the Canvas and once the block is released, the Image Manager mode will appear. You can start uploading an image from your computer by clicking or dragging the image into the upload area.
Now just double-click the picture you like, to select it, then you will see it on the canvas. If you need to change the image, you can always double-click on that block to reopen the Image Manager.
The image will automatically try to fill the available width of the element containing the image, but it can always be resized using resize handles by drag and drop.