How to make the character's hand glow?

Hi everyone,
I am a beginner at unity and currently working on a project that needs to create effects to represent errors.

I want to make the character’s body part glow to represent the error. But all the tutorial I find is to make the entire body glow. And the model I download from Mixamo only has two meshes, one for the joints one for the surface.

So how can I ONLY change the material of the character’s hand?

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