How to reset morph curve?

I made a change to my morph curve in one of my animation, now I want to delete it, but can’t find any ways to do it, please help.

I am following this tutorial:
https://docs.unrealengine.com/latest/INT/Engine/Animation/Sequences/Curves/index.html

It teach me how to add a curve, but how do i reset it if I want to start again?