How do i change my default 3rd person characted

I Have this zombie model and this wolf model And i can’t use either of them even when there set as “player” Am i missing something?

I really, really suggest you take a look at some of the tutorials in the link I posted in one of your other questions. Once you get to understand the basics a bit better, most of the questions you posted so far will answer themselves.

There is also an in-depth tutorial concerning a 3rd person game on the Unity site itself: 3D Game Kit Reference Guide - Unity Learn