Click the "DRAW TILE" button to draw a tile. If you draw a sandstorm, you crash and lose your turn. When you want to lock in your position, click on each tile you drew to add a camel (colored disc). After you add a camel, you can click on it to toggle it into an oasis (black dot). You only get three oases per game.
When you draw a sandstorm and you haven't drawn any board-tiles yet, the sandstorm tile goes out of the game. When all sandstorm tiles are gone, the game ends. At the end of the game, you get one point for every camel that's connected to one of your oases or to the white oasis in the middle of the board.