If you are using the included character (Steve) prefab, this will already be done for you.
If you are using your own character then you can follow these steps:
1. Add the Pick Up - Drop and Interactor components to a child gameobject of your main character. Call this child gameobject Interactions. Also add a box collider that is set as a trigger. Like this:
When adding the Pick Up - Drop component, set it up according to the Pick Up - Drop page.
