Longer version with narration
Melds. A meld is valid if it contains at least two natural cards of the same rank - aces down to fours inclusive - and not more than three wild cards. Jokers and deuces may never be melded apart from natural cards. A set of three or four black threes (without wild cards) may be melded only when a player goes out.
Something that will help you play this game because of the multiple decks is a Card Tray.