I already made model with 10 classes 10 after training by Yolov5. I would like to add new two classes into the made model 12 classes. How can I modify the the made model 12 classes by 13 classes when I train by transfer Learning?

I already made model with 10 classes 10 after training by Yolov5. I would like to add new two classes into the made model 12 classes. How can I modify the the made model 12 classes by 13 classes when I train by transfer Learning? #26298