In a new layer create a 94 px x 94 px sized, #000000 circle with the ellipse tool. Set the ellipse option to fixed size and input the size info, it's important that your sizes are the same as what I listed in this tutorial.
Step two:
Add the following layer styles.
Blend Mode: Normal
Opacity: 100
Noise: 0
Color: #FFFFFF
Technique: Softer
Source: Edge
Choke: 0
Size: 6
Contour: Default
Anti-aliased: Uncheck
Range: 50
Size: 9
Position: Outside
Blend Mode: Normal
Opacity: 100