How to mandate text box in user form

[kolimukesh]

Dear I have an user form i want to mandatory text box (No. 3) please help

Private Sub TextBox1_Change()[W11] = Me.TextBox1.Value
End Sub


Private Sub TextBox2_Change()
[W12] = Me.TextBox2.Value
End Sub


Private Sub TextBox3_Change()
[W13] = Me.TextBox3.Value
End Sub


Private Sub TextBox4_Change()
[W14] = Me.TextBox4.Value
End Sub


Private Sub TextBox5_Change()
[AA10] = Me.TextBox5.Value
Me.TextBox5.Enabled = Me.CheckBox1.Value
End Sub


Private Sub TextBox6_Change()
[AA11] = Me.TextBox6.Value
Me.TextBox6.Enabled = Me.CheckBox

 

[Yongle]

How is the user quitting the userform?