Happylady, welcome to the forum. If you look at the tabs at the top of the screen, click on the Download Games tab. Click on PC Games button. Find a game and click on the picture. the game screen will come up. On the left side will be two buttons. One will say Download, one will say Buy Now. If you click on the Download button, you will start the process of downloading a demo version of the game. This will allow you to play for one hour so you can decide if you want to buy the game. If you choose not to buy the game, go to Program Files and find the game name and open the folder. Click on the Uninstall to remove the game.
...If you are having problems with downloading a game, what problems are you having? Are you getting error messages? What game are you trying to download. I know they just installed a new patch on Fishdom yesterday so try that to see if it works.
...Good Luck