UMG button in axis mapping input

hi guys I’m new with unreal engine 4, I’m trying to create a game for android, I would like to add an umg button widget that when you press the character go forward, then I tried to change this in the input axis mapping,but I do not know how to do it
I would like “when pressed button” appear at the command where it says move forward
, you know how to do it, thank you

I have same issue

hi did you got any solution?