Add a note to treeview via button from another form

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Visual-Studio

treeview

On form 1 I have this button as a test

public void button1_Click(object sender, EventArgs e)
{
treeView1.Nodes.Add("object");
}


i want to do the exact same function but with a button on form 2

Form1 Form1 = new Form1()

public void button1_Click(object sender, EventArgs e)
{
Form1.treeView1.Nodes.Add("stripper");
}

I have a feeling it's something very simple and stupid but i'm stuck.

Any help would be appreciated

What I have tried:

I have tried to add a variable to Form1 and call it from Form2, and the program doesn't show any errors so that's why I am so confused.