Need help getting system to read fields from Form2 C#

How can I get Form1 to read the textfields in Form2?

Presumably Form1 creates an instance of Form2... so hold on to that instance, and expose appropriate properties on the form:

Form2 form2 = new Form2();
form2.Show(); // Or ShowDialog?

string name = form2.UserName;

The implementation of UserName may well just fetch the value from the text field:

public string UserName { get { return userNameTextField.Text; } }

You could expose the text field directly with a property, but personally I tend to think that a form should "own" its UI, and not let other code mess with it.