Step:1 Select a single layer from the Layers panel.
Step:2 Do one of the following:
-:Double-click the layer, outside the layer name or thumbnail.
-:Click the Add a Layer Style icon at the bottom of the Layers panel and choose an effect from the list.
-:Choose an effect from the Layer > Layer Style submenu.
-:To edit an existing style, double-click an effect displayed below the layer name in the Layers panel. (Click the triangle next to the Add a Layer Style icon to display the effects contained in the style.)
Step:3 Set effect options in the Layer Style dialog box.
Step:4 Add other effects to the style, if needed. In the Layer Style dialog box, click the check box to the left of the effect name to add the effect without selecting it.