First things first, you need to locate the power steering fluid reservoir in your car. It's usually a transparent plastic container with a cap on it, and you can find it under the hood of your car. Check your car's manual if you're not sure where it is - it's like a treasure hunt, but way more fun!
Now, once you've found the reservoir, you'll need to check the fluid level. You do this by pulling out the dipstick (yep, it's like the oil dipstick, but for power steering fluid!) and wiping it clean with a rag. Then, insert it back into the reservoir and pull it out again to get an accurate reading.
If the level is low, it's time to add some fluid! Make sure you use the correct type of fluid for your car - your manual will tell you what kind you need. And don't overfill it, or you might end up with a mess on your hands (literally!).