Hello. You have not submitted the text to which this question refers, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
The tone of a text is the feeling that the author wants readers to feel while reading, meanwhile, the meaning of the text is the message that the author wants to convey to the reader when the reading is finished. In every text, there are words that refer to the meaning of the text, as they represent a question to be analyzed and a reflection to be announced. Words like "poverty," "inequality" and "difficulties," for example, refer to a text that has significant significance to socioeconomic inequality and the difficulties it imposes.
On the other hand, words like "joy," "enjoyment," "rejoicing" and "fun," for example, can convey a tone of happiness to the reader.
In that case, to answer your question, you must read your text and recognize those kinds of words.