Editing a RichTextBox from another class. [RESOLVED]

[deranged]

So far, I have a richTextBox made with Visual Studio (Named richTextBox1). I have a separate class that needs to change the text in the box. The textbox is in class Form1.

So far, what I have is :

In class Form1

		public void txtchange(string changeinfo)
		{
			richTextBox1.Text += "\n" + changeinfo;
		}

and in the other class, I have

Form1.txtchange("blah blah");

The error it gives me on build is:

Form1.cs(214): An object reference is required for the nonstatic field, method, or property 'GUIbot.Form1.txtchange(string)'