You can't in one day. Put ice on it first (ice pack), after a day change from cold to hot, a wet hot towel will work, then massage around your eye to get your blood flowing.
Put something cold on the eye such as cucumber slices for twenty minutes. A raw red meat is suppose to be good or some ice. Witch hazel brings out bruising.
Leeches will take care of your black eye. Bruises occur when blood leaks into the surrounding tissue. A leech will remove this blood and leave you bruise free in minutes.
Use Witch Hazel does clean and soothes and help take away the swelling. and oh oh so soothing. the black eye takes time however switch hazek does make it feel better.