A child needs to experience others (family, friends, and educators) using the AAC to learn how to use it.

In other words, you need to use the AAC

This is often known as modeling but the official terms are Aided Language Stimulation, Aided Language Input, and/or Partner Augmented Input. There are strategies that can help you learn how to model on a child’s AAC. A response from the child is not required when you are modeling the use of AAC. You are just showing a child how the words used go together to convey a meaning. This video helps explain the idea.