Answer:
When applying text to self, you are required to use your own experiences in correlation to the story you've read. Thus, you need to think deeply about the events in the novel and surmise if you've ever experienced similarities. To Kill a Mockingbird has numerous events that might be similar to things you've experienced. Racism is a major theme..... growing up (Jim and Scout), teachers, friends going through changes in their homes (Dill). Other ideas might include friends who aren't accepted because they're different (Dolphus Raymond), someone who has died, or even a young, abused girl like Mayella.
I hope that helped!