How to edit a Blueprint in Configurator 2?

1. I have successfully created Blueprints for my iPads.
2. I have Prepared them
3. I have applied a Blueprint to one iPad
4. I have then edited the Blueprint, but when I connect the iPad it does not automatically update the new changes made within the Blueprint.

So my question is, how do I update the iPad without having to re-prepare and send the Blueprint all over again?

Many thanks