Editing custom components variables in editor instead of reference

Hello!

I am new to UE4, so sorry if this is a dumb question !
I created a new component (inherited from ActorComponent) in my project. I added this component as a variable in a blueprint in order to modify it in the editor (by the details Panel). However, I would like to modify the component variables in the editor instead of a reference of this component.

266614-test.png

For example, Test is a component with two variables “a” and “b” with the UPROPERTY(EditAnywhere, BlueprintReadAndWrite). But here, I can just attach a reference to the component and I can’t define its variables.

How can I set the component variables instead of setting the test component?
I hope it is clear enough, thanks for your time and help!