Jem helps Atticus search for Dill when he runs away by informing the sheriff and looking for him around town. He also keeps an eye out for Dill's return at the Finch house.
If you're asking about when Scout and Jem find Dill under the bed, then Jem was the one who went to Atticus and told him that Dill had come.
When Dill ran away and came to Scout for help she was prepared to hide him. When Jem found out, he immediately told Atticus, thus driving a deeper wedge between Jem and Scout.
Dill dared Jem to go up to the Radley house and knock on the door. It is easily seen that Jem has his pride, but is also frightened by the house. Dill sees Jem's fear and decides to lighten the dare by saying all he had to do was touch the house. Hoped that helped. (:
Dill (Charles Baker Harris) runs away from home in To Kill a Mockingbird.
Dill and Jem see the shadow of Atticus Finch when Jem is on the porch of the house.
Dill is about seven years old(when the story begins). Younger then Jem but older than Scout.
Dill dared Jem to run up to Boo Radley's house and touch the porch.
Jem and Dill are sitting up high in the balcony during the courthouse meeting, as they are not allowed to sit on the main floor with the rest of the adults. They are watching the trial from a distance to better understand what is happening.
Jem goes to the Radley's house and slaps the side of it because Dill dared him to.
Jem told on her and Dill, and let Atticus know that Dill was under Scout's bed and had run away. The last remaining code of their childhood was that they never tell Atticus their secrets.
Jen went and got Atticus when Scout and Jem found out that Dill ran away from home.
In "To Kill a Mockingbird," Jem's loss of innocence is symbolized by his reaction to Tom Robinson's trial and the injustice that he witnesses. Jem's realization of the deep-rooted racism in their society shatters his beliefs in fairness and equality, marking the end of his childhood naivety.