For example, perhaps you like to play against the computer ("with bots") in Hearts. But for Spades, you want to play with "Registered Players Only," and "Exclude Games in Progress." All of those settings are accessed from the Options panel. And you get to that panel by clicking on the Options button.
Each game (Spades, Hearts, etc.) has its own Options button, so you can customize your preferences for that particular game. The Options button is in the lower left corner of each "game panel" on the home page at World of Card Games. The home page is the page where you can see all the different types of games available, from Hearts to Gin Rummy.
A picture says a thousand words, so here's a screenshot with each of the "Options" buttons encircled in green. If the picture is not large enough to see the "button" clearly, click on the image, and you will see it even larger.
|the Options button, highlighted by a green circle|