Yahtzee is played using the RS Games Client. You will need an account on RS Games with the client installed, basic knowledge of its navigation and basic Yahtzee gameplay. Follow the link to,
RS Games Yahtzee Game Instructions
to download the client or find out how to play Yahtzee using the RS Games client.
If more than 5 players have joined, the players will be split up into differnt games, otherwise all will play in the same game. Players arriving after all games have started will be allowed to join subsequent games. Scores are collected after each of 3 games and at the end of the 3rd game the player with the highest point total is declared the winner for the day. Each day's scores are kept track of for the month and averaged dropping the lowest 3 scores. On the last Yahtzee game for the month, the top 3 ranked players will have a one game playoff for champion of the month with the prize being bragging rights. If one of the top 3 players is not available for the championship game then subsequent players will be offered the positions until the 3 spots are filled.
All of the monthly stats are sent out in the next game's announcement other than the championship game.