Hello. Your question is incomplete, so it is not possible to answer it accurately. However, I will try to help you in the best possible way.
It is only possible to know the theme and support details of your text by reading it. In this case, to answer this question, you must recognize the main theme of your text (which is the main message that the text wants to send). After recognizing the topic, it is possible to find the support details, because these details are additional information that explain or prove the main topic.