C# FPS Pick up and Carry script help?

Hello, I am new to coding and would like some help with how I can edit this code. I was doing a tutorial and I wanted to edit it. I want the player to be able to press E to pick up the object and then also put it down by pressing E again.

Right now you can press E to pick it up and then right click on mouse to drop it.

void Update()
{
    //check distance of gameObject and player
    float dist = Vector3.Distance(gameObject.transform.position, player.position);
    if (dist <= 4.5f)
    {
        //can be picked up
        hasPlayer = true;
    }
    else
    {
        hasPlayer = false;
    }
    if (hasPlayer && Input.GetButtonDown("Use"))
    {
        GetComponent<Rigidbody>().isKinematic = true;
        transform.parent = p_Camera;
        beingCarried = true;
    }
    if (beingCarried)
    {
        if (touched)
        {
            GetComponent<Rigidbody>().isKinematic = false;
            transform.parent = null;
            beingCarried = false;
            touched = false;
        }
        if (Input.GetMouseButtonDown(0))
        {
            GetComponent<Rigidbody>().isKinematic = false;
            transform.parent = null;
            beingCarried = false;
            GetComponent<Rigidbody>().AddForce(p_Camera.forward * throwForce);
        }
        //right mouse button
        else if (Input.GetMouseButtonDown(1))
        {
            GetComponent<Rigidbody>().isKinematic = false;
            transform.parent = null;
            beingCarried = false;
        }
    }
}
void OnTriggerEnter()
{
    if (beingCarried)
    {
        touched = true;
    }
}

}

I’m guessing I have to make “else if (Input.GetMouseButtonDown(1))” to “Input.GetButtonDown(“Use”)” but I’m not sure what to do for " (Input.GetMouseButtonDown(0))." Any help would be appreciated.

Right now mouse button 0 throws it, and mouse button 1 drops it.
What you should do is have mouse button 1 or “e” drop it.
In code, this would be:

else if(Input.GetMouseButtonDown(1) || Input.GetButtonDown("e"))