Click on the menu button and hit settings. Scroll down to the bottom and tell me what Market version you have. Is it a black themed one or a green/white themed one?
If it is 3.1.5, when you go to the app, there will be pictures of the app. Right below that, there is an option for automatic updating
If it is 3.1.5, when you go to the app, there will be pictures of the app. Right below that, there is an option for automatic updating