Apply shadows to Shapes and lines by clicking the target object, then clicking the “Shadow” tool from the Toolbar.

This will open the Shadow menu.

Switch Shadow to “On” to apply it to your object.

The Shadow menu also allows you to change the color, opacity, and blur, in addition to how the shadow is dispersed.

Applying shadows to multiple objects

If you have layered a few objects over each other and want to apply shadow, Cacoo usually automatically applies shadow to every individual object:

 

 

However, if you want to apply shadow to only the background, select all objects that you are manipulating currently, then, click “Shadow.” Check “Background”, and the Shadow will only appear over the background, not any of the layered shapes.

Editor information before 6/27/18: https://support.cacoo.com/hc/en-us/articles/212778448-The-Editor