Exactly the same way . The idea is to get reference of the form you want to change . Since Forms in .NET are classes and classes are passed byref we'll do it this way , through the constructor :

Steps :
in Form2 do this :
Override the constructor to take reference of Form1 :

VB Code:
  1. Dim frm2 As Form
  2.  
  3. Public Sub New(ByVal frm1 As Form)
  4.         InitializeComponent()
  5.         Me.frm2 = frm1
  6. End Sub


Then ,

in a button on Form 2 , paste this code :

VB Code:
  1. Private Sub Button2_Click(ByVal sender As System.Object, ByVal
  2. e As System.EventArgs) Handles Button2.Click
  3.         Me.frm2.Text = "Changed from Form2"
  4.  End Sub


Third , Go to Form1 and change the code to this :

VB Code:
  1. Dim f2 As New Form2(Me)
  2. f2.Show()

Run , test , Working ....

If you got stuck just shout and we'll be around .