Changing/Modifying animations in existing Blueprint?

Hey, I’m pretty new to Unreal, I’ve searched around Unreal tutorials, but all show how to create stuff from the beginning.
I would want to use Third Person blueprint project and make it use animations from ‘Animation Starter Pack’ as both use same mesh and skeleton.
If I know how to do this, I would then be able to add and modify animations to existing character, blueprint etc.

Can anyone help me with this problem? How do I change animations in ThirdPerson blueprint to make it use animations from ‘Animation Starter Pack’?
For example, run animation to use Sprint_Fwd_Rifle, giving the character good run animation while carrying rifle.