You'll be shown a slide with a color. Study the color until you think you can pick it out from among others, without seeing the original slide. When you think you can do this, click 'Next', and we'll show you four colors, one of which matches the original. Click the matching color.
The four color choices will get more and more similar as the quiz progresses, so don't let the first few questions make you overconfident!
In order to create a playlist on Sporcle, you need to verify the email address you used during registration. Go to your Sporcle Settings to finish the process.