Joker Poker is a Kings or Better variation with one Joker in the deck acting as a wild. There are many variations of Joker Poker paytables. In addition the lowest winning hand in some versions of Joker Poker is Two Pairs instead of Pair of Kings. Usually the version with Pair of Kings has a smaller house edge so you should choose that game.
Choose how much you willing to bet and have the cards dealt to you. Then click on any cards you want to hold and have the rest be new cards drawn. If you win you have the option to half double your winnings, double your winnings or collect your winnings and start again. To win the Double or half double you are given 4 cards and the dealer has 1. Your card must be higher than that of the dealers. If it's a draw or your card is lower you lose.