It's very easy to use a code. Click on "Show coupon code". Copy the code and look out for the opportunity to use it.
Now that you have a code, let's use it:
1. Go to thrifty.com.
2. Pick a car, choose a pick up location and the dates you will need and return the car.
3. There are many options to save, pick one and click on "Get rates".
Under the heading "Promo", type in your code and press "Get rates". You can also get other deals at Thrifty by looking through their website.