Whatever you've got in the <title> tags on your post is what comes up in google. Without looking at the theme you're using I can't say exactly how to change this, but it can be done by editing the code in the header page
As someone already said, that's done in the theme. I prefer Post Title - category, tag1, tag2, etc... Personally, I don't like plugins like all in one, themes should do it right in the first place.