cs3 blur

[spillage]

Hi All,

This really is the first time I have tried photoshop with any of my images.

I came across a great tutorial on how to deal with elongated stars which works well and more importantly is easy enough for me to understand. However is leaves a bit of dark circle in the image if zoomed in and I cannot work out how to blur this line out.

All the stuff I seem to find goes on about cutting our part of the image and blurring the whole background...I thought the blur tool would work but it seems not..(user error?)

 

Any help would be much appropriated but I am a PS newbie.