Use the Update Command :
Dim cmdUpdate As New OleDbCommand
cmdUpdate.Connection = cnnOLEDB
cmdUpdate.CommandText = "UPDATE TableName SET FieldName = '" & txtName.Text & "' WHERE IDFieldName = " & txtID.Text & ";"
Try
cmdUpdate.ExecuteNonQuery()
Catch ex as Exception
MessageBox.Show(ex.Message)
End Try