How to add animations from Asset Store

I am currently using Unity’s ThirdPerson Starter Assets which comes with being able to walk, run, jumping, and other animations. I am making an action RPG and want to be able to add other fbx files like melee weapon attacks that I also got from the asset store that would trigger based on mouse clicks and button presses. The documentation for the Starter Assets didn’t include any guidance on how to add custom animations either.