1. Click on the Inspector  button to display the Inspector.
 button to display the Inspector.
2. Click on the Radial Gradient  button to fill with a radial gradient.
 button to fill with a radial gradient.
3. Click and drag in the Gradient  well to change the radial gradient center.
 well to change the radial gradient center.
4. Click on the Opacity slider to change the gradient opacity.