What is the best/easiest way to add animations to a mesh I added to the FPSController

I imported the character file and used the FPSController and successfully added the third person Ethan mesh to it. The mesh moves around like the 1st person correctly, except it doesn't have any animations. For example, when I jump, the mesh just goes up in the air and then back down. What would be the best or easiest way to add animations to this mesh. I attempted to look at the "FirstPersonController" but don't know where to start since I did not write the code and it's hard to jump into. Sorry if this is simple, I am new to Unity3d. Thanks in advance.