You are looking at a website.  A button, clearly labeled
“start,” occupies the center of the screen.

You have two choices:

1.  To start, click the button labeled “start.”  If
you’re having trouble finding the start button, click here for a
screenshot that will guide you to it.

2.  To not start, do almost anything else.  Click
somewhere that’s not the start button.  Pirate a Beatles album.  Go to the kitchen.
Really, you can’t mess this up.  Just don’t click
that start button.