To attach a photo, you have to upload it somewhere, then you can post the link to it here. www.imageshack.us
is a free site you can upload pictures to, if you don't have your own webspace.
As far as the black line goes, its likely that its the result of some green spill on the subject of your photo. If you can attach an image, a version of the original photo, prior to any keying would be helpful as well.
A few things you can try to help with the black edge are:
1. Tweak the settings of the key around to see if you can improve it at all. Though I'm guessing this is what you already tried.
2. Change the Composite blend mode of the light spill filter, and play with its size, to see if you can improve things that way.