Player Key Binding Doesn't Work, Can Some One Help?

[Guesscui2018 (BenWolfman)]

I’m setting up a player key binding system to try to make the jump button a custom binding, I followed some tutorials, having enhanced input system setup and worked just fine for my player character’s controller.
I’m currently using a simple widget to test the system.
The problem is, the new key doesn’t apply to the character’s controller it seems, the widget is working and I’ve done print string for a test. It’s just the key is still the original one that applied to the control always.

Here’s the screenshot of my blueprint, can some one give some hints where I was doing wrong?

Many many thanks!!!

[Guesscui2018 (BenWolfman)]

Okay, figured out by myself, for who’s experiencing the same problem - use “Unmap All keys from Action” instead of “Unmap Key” to unbind the original key before you apply a new key, worked just fine now.