How do you find the writer's point of view?
Point of view is simply who is telling the story. If the writer uses the words "I" or "we," they are using first person POV. If they use "he," "she," "it," or "they," they are using third person POV. If they use the word "you," they are using the rare second person POV.
You don't. You can educate someone about your point of view in order to increase his or her awareness about the subject, but chances are slim you could ever change someone's point of view. It would be better and easier to find a way to have someone respect your point of view instead of following it.