Changing the player model

Hello.

I want to create a mod where you can play for different races, 

but I ran into a problem with changing the player's model.

I want to link the race element model to the player model, but I don't know how to do it.

I found a tutorial on the forum https://mcreator.net/forum/97269/tutorial-how-change-and-animate-player-models.

I would like to know if there is a way to do this in some other way, If so - how?

If not, how do I link the player model to the entity model.

Sorry for the incorrect English.