Juce tutorial. How to package a plugin with Application Packages?

Hello, i try to package a plugin AU that is in my directory ~/Library/…/Components/P.component using the Application “Paackages” as explained in the Tutotial of Juce.
However, i don’t succeed to select it. And when i should select it? It is not clear in the tutorial.
Thanks for help please,
Best wishes,
Frédéric.