To play at an online casino, first, choose a reputable site and create an account by providing your details. Next, deposit funds using a preferred payment method, such as credit cards or e-wallets. Browse the game selection, which typically includes slots, table games, and live dealer options. Select a game, familiarize yourself with the rules, and place your bets. Always set a budget to manage your spending and take advantage of bonuses or promotions. Finally, enjoy the experience, but remember to gamble responsibly and know when to take breaks.