Now that the code is set up to work with Widget Blueprints, create a Widget Blueprint to display the Character's power in the HUD.

Check out the source here, with the project available for download:

User Interface with UMG:

UMG UI Designer Quick Start Guide:
(00:05) - Recap & Fixing Compile Errors
(01:58) - Creating the HUD
(05:54) - Creating a HUD GameMode Blueprint