sry, ima do this quick, for more intermediate designer. Take the lasso tool, and selct the render(that i salready on BG) very fast, on 15 feather. now, give it a layer mask. THen get a brush and brush over slightly until likeing. Maybe lower opacity a lil Ta-Da....perfect blending.
I think that's more of a beginner tut, so it would have been nice if you said where to find the effects. But I guess it's good for someone who isn't farmiliar with the concept.