How to change the float value inside the shader file with a C# script?

Unity Engine
1

I know that to change the value of the UI text is
textName.text = “A number of value”

But in this situation I want to change the value of the float inside the shader file instead of the UI text.
But I don’t know what code can do this function.
For example, I want to change this float value. What should I write in the c# script?

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I tried this but it is not working:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ChangeShaderSpeedScript : MonoBehaviour
{

public Material myMaterial;
public float someValue=1;

// Start is called before the first frame update
void Start()
{
myMaterial.SetFloat(“speed”, someValue);
}

// Update is called once per frame
void Update()
{

}
}

If the speed is 1, the animation plays. But it doesn’t play as the speed is still 0. I have put the Unlit_NewUnlitShader Material in myMaterial, but it is not working. What should I do?

Please answer me the CODE instead of concept! As I really know the concept.
Tutorial videos are also welcome.

2

I found the solution! The name of “speed” should be “_speed”