In this step we will start by creating a new layer. (ctrl shift N). Next we will create a clipping mask by right clicking on the top layer and scroll to 'create clipping mask'. Now change the background colour in your tool bar to 65645F. We now have our colours to create a gradient. Select the gradient tool by right clicking the paint bucket tool and selecting gradient tool. In the top tool bar, make sure the linear gradient is selected - that is the first in the horizontal list of gradients. Next make sure reverse, dither and transparency are selected. Start your gradient directly in the middle of your ball and pull to the bottom right. Stop just before the ball starts changing colour from where you added the inner glow. Your ball should now look like this: