Unlock the background layer

Unlock the background layer.

Nontransparent background layers are locked. To change the stacking order, color, blending mode, or opacity of a locked background, you must unlock it by converting it to a standard layer.

Double-click the Background layer in the Layers palette.

In the New Layer dialog box, type a name for the layer.

Set the layer options as desired, and click OK. Photoshop converts the Background layer into a new, editable layer.