Add a Shadow

You can add a shadow to a selection by clicking the Effects button on the Tool Settings Panel and choosing Shadow from the drop down menu.

Adjust the position and size of the shadow using the X and Y slider bars around the preview pane. Move the slider along the X-axis to move the shadow horizontally and move the slider along the Y-axis to move the shadow vertically.

Add a shadow to a selection

Adjust the smoothness of the edges from soft to hard. The softer the shadow, the more it will blend in with the background. As you make the edge harder the shadow will become more opaque.

You can also adjust the darkness of the shadow. Choose anything from a bright white shadow to a dark black shadow.

While the selection is still active, you can go back to this dialog and select Remove Shadow to get rid of the shadow you created. You can also just simply click on the Undo button on the toolbar or select Undo (Ctrl+Z) from the Edit menu.