I installed the mod, but I don't know how to "activate" it.
I've installed other mods, and activation isn't necessary; it's automatic. However, with EMF, it hasn't activated, and I don't know how to configure it. There are no animations, and the textures are like normal Minecraft.

you need to install a resourcepack that uses EMF or Optifine custom entity model or animation features, like https://modrinth.com/resourcepack/fresh-animations