Replacing the battery on your MacBook can be expensive, especially if you use Apple's official service. Doing it yourself is cheaper and not too hard.

If you take a look at your laptop's keyboard, you'll notice that the top row keys have icons printed above, with "F" and a number, like F1, F2, and so on, below each one. These are known as function ...

You can set a message to appear onscreen when people log into your Mac. Here's how to set it up, as well as how to remove it.