If you get into an accident, you should immediately call the authorities. A medical team can help injured parties, while police officers can create and file an official report. If no one needs immediate medical attention, exchange insurance information with the other driver and take pictures of the damages. This information can be helpful later if you have to claim insurance when you are not at fault.
Once the situation has calmed down, inform both insurers that you got into an accident. If the other party is determined to be at fault, you can start to file for a third-party insurance claim and receive compensation for damages or injuries.