If there is something wrong with your car and you think it’s covered by the warranty, you should stop using your car and report the issue to your provider. You will need to tell them about the problem, and they should then tell you what to do next.
If they authorise the repairs to your vehicle, you can take your car to an approved garage to get it fixed, and the provider may pay the garage directly. If you take your car to a different garage for repairs, you may be able to pay and then claim the costs back from the provider. Your policy documents will have more information on this.