When the program starts, it uses the following code to make its WebBrowser control go to the user's home page.

// Start at home.
wbrDisplay.GoHome();

When you click the Set Contents button, the program uses the following code to display the HTML code in the upper text box in the WebBrowser.

// Set the HTML contents.
private void btn_Click(object sender, EventArgs e)
{
    HtmlDocument doc = wbrDisplay.Document;
    doc.Body.InnerHtml = txtHtml.Text;
}