1. Click on the element whose shadow you want to edit
2. Select the style tab on the upper menu toolbar (should be selected by default).
3. Click the Shadow button on the style toolbar at the top of the screen
4. Select the type of shadow:
Glow - A shadow along all of the outside edges of the element
Inner Glow - A shadow along all of the outside edges of the element
Shadow - A shadow along two of the outside edges of the element
Inner Shadow - A shadow along two of the inside edges of the element
5. Edit the position and properties of the shadow as desired
