UE4 HUD Image Changing

Hello, Im trying to make a HUD which a game life system and i wanted to use images to display the life, i need to know how to change those images as life is deducted. This is in a 3D SideScroller format, any help would be great. Thank you!

This series of tutorials should get you pointed in the right direction keep in mind that images and materials can be used and applied to UMG and HUD elements.