How do i stop my macbook from going to black screen?

go to the energy saver preferences in the System Preferences. There you can set the sleep time for the computer and the display. The computer is going to sleep and that’s why its logging you out of MSN, so set that to a higher number, but beware that you’ll drain your battery more quickly as well

Just like every other computer, you have to adjust the power settings. :)

Ha! We posted at the same time.

Download Caffeine. It will add an icon in your menubar. Click it, the screen will always be on full power, click it once more and it will go back to default.

go to the apple icon at the top of your screen. Then click system preferences. Go to energy saver in the hardware options. Then open the show details section. There you will be able to adjust the time in which your computer goes to sleep or the screen darkens.

What if I can not change my energy saver preferences, How do I download Caffeine????