For your convenience, merge down now all the layers composing the button in a group.
Copy the new made group and place it exactly the same way it is shown below.

Change now the corresponding parameters.

Using the next instrument , represent a circle with the parameters shown next step.

Blending Options-Outer Glow

Blending Options-Gradient Overlay

Gradient’s parameters.

Blending Options-Stroke

Take the shown tool and make a figure like this one indicated below.

Blending Options-Gradient Overlay