Assuming you already know how to play poker as most everyone does.
You start by choosing a denominator. Every platform provides their own options for you to choose from that may include .1 cent (penny), .2 cents, .5 cents, .25 cents, .50 cents, $1 (Dollar), and up.
After selecting your denominator, you will then have the option of choosing how much you would like to bet. Most games have a limit to what you can bet that's usually from 1 to 5 coins, whereas others allow you to bet up to 10 coins, 100 coins, or more.
Now you are ready to start playing. The majority of games have two ways to place your first bet. You can either bet one or more coins at a time by clicking on "Bet" (or "Bet 1") or you can hit the "Bet Max" button to bet the max amount allowed. After that, you can continue betting the same amount by hitting the "Deal" button.
Betting max, by either hitting the "Bet Max" button or betting one coin at a time until you reach the limit, will usually result in your hand being dealt out automatically. Otherwise, if you bet anything under the limit, click "Deal" to begin and 5 cards will be displayed onscreen.