I am working n CS6 and i am trying to remove the background of the palm tree and when i click on refine edges and do over the edges to remove the blue it doesn’t achieve anything i am wondering if you know what night be the problem?

Can you submit a screenshot of the refine edge area? Did you make a selection of the tree?

Ok. Did you increase radius? I usually view with black background. Did you output to layer mask to see? Try to Check decontaminate colors.

Yes i have made rough outline.