Hanna is spot-on and 4x800mg tablets are a good dose. Make sure it is l-malic, (the more natural form), which it normally is if it comes from a health store.
It works by micro-dissolving the bile secreted in response to a meal; consequently it should be taken with or after a meal with a cup of water. Say two with main meal and one each with breakfast and lunch. If you also consume some fibre in the meal this will bind to the bile and it will be evacuated normally rather than being reabsorbed and re-cycled by the liver. The liver will produce a higher proportion of new bile that will flow through the biliary system.