set one picturebox image on another picturebox image on location 480,380 by clicking on the image

Assuming you have two PictureBoxes, pictureBox1, pictureBox2, that are both the same size, and you want clicking on pictureBox1 to move pictureBox1 so it completely covers pictureBox2:

1. in the Visual Studio designer, double-click on pictureBox1: you will be automatically switched to the code-view window for your Form, where you'll see a "blank" EventHandler for the Click Event has been generated for you.

2 add the code below to the EventHandler:

private void pictureBox1_Click(object sender, EventArgs e)
{
    pictureBox1.Location = pictureBox2.Location;

    // or ...
    // ... pictureBox1.Location = new Point(480,380)

    // in case pictureBox1 is behind pictureBox2
    pictureBox1.BringToFront();
}

To me your question shows that you need to get familiar with the basic functions of using the built-in Controls on the Tool palette in Visual Studio. Each Control, if double-clicked, will generate some kind of EventHandler (they will vary based on the Control, but the most common is a Click EventHandler.