vb.net dataset question

I am a novice with vb.net  - I have used access alot but very little experience in vb.net.

I built a simple form that has two fields and is connected via dataset.

I need help understanding how to update from  the dataset back to the table from where it came from.
 

THIS IS THE CODE
Public Class Form1

    Private Sub CustomersBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CustomersBindingNavigatorSaveItem.Click
        Me.Validate()
        Me.CustomersBindingSource.EndEdit()
        Me.TableAdapterManager.UpdateAll(Me.NwindDataSet)

    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'NwindDataSet.Customers' table. You can move, or remove it, as needed.
        Me.CustomersTableAdapter.Fill(Me.NwindDataSet.Customers)

    End Sub

    Private Sub BindingNavigatorAddNewItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BindingNavigatorAddNewItem.Click

    End Sub
End Class