Asset Editor Toolkit: select spawned actor

Hello everyone!
Recently I have been following this Unreal Fest tutorial where they explain how to code a custom asset editor for a custom asset type, using the asset editor toolkit, implemented in the Unreal Engine code.
I have downloaded the Unreal Fest project and looked inside, trying the limits of the tool. I’ve managed to spawn some actors in the editor scene, but I can’t figure out how can i select each actor individually. Right now, the actors appear in the editor scene (they have a billboard so I can see them), and I can move the camera around, however when I click on the viewport i can’t select any actor, just pan the camera.
Any ideas on how could I select the actors in the scene? Any help is welcome.
Thanks!