In an AI Message Project - As long as a message has not been finalized, you can click into the message you want to change and modify it, or click the three dots “...” on the message and select "Edit Project"
In the Phonzai Mixer App - Under the “Audio Files” tab, click the three dots “...” on the order you want to change and select “Edit/Change”
You may need to select “Yes, Create a Copy” to create a new file that can be modified.