The card refers to the packaging: the recommended daily amount and the method of use are given there; each tablet contains 250 mg of activated charcoal, and the pack holds 10 tablets. The recommended daily amount must not be exceeded; take it at least 2 hours before or after other preparations.
General information (not a manufacturer's instruction): charcoal is usually taken with water; in case of constipation and abdominal pain, see a doctor.