1. To start a game, select "Play" from the main menu and choose "Quick Play" to join a random game or "Create Game" to start your own game.

2. Once in a game, the rules are the same as the physical version of UNO. The objective is to get rid of all your cards before the other players do.

3. To play a card, tap on it and then tap on the discard pile if it matches the number or color of the top card. If you don't have a matching card, tap on the draw pile to draw a card.

4. You can also use special cards to block your opponents or force them to draw more cards.

5. Be sure to tap the "UNO" button when you have one card left to play, or you will be penalized with extra cards.

6. Keep playing until one player has no cards left, and they will be declared the winner.