Hi sweetlip6,
I moved your thread over to the Optimus Black section where hopefully the folks with this device can get you the help you need.
My first thought is that the apps are not available/compatible with your device. If you visit the Play Store via a web browser on your PC (and sign into your Google account) it should let you know. If you go to one of the app's pages, it should tell you if the app is not compatible with your device where the install button should appear.