One of these should help:
Sub ActivateNextBlankDown()
ActiveCell.Offset(1, 0).Select
Do While Not IsEmpty(ActiveCell)
ActiveCell.Offset(1, 0).Select
Loop
End Sub
'''''''''''''''''''''''''''''''''''''''''''''''''''
Sub ActivateNextBlankToRight()
ActiveCell.Offset(0, 1).Select
Do While Not IsEmpty(ActiveCell)
ActiveCell.Offset(0, 1).Select
Loop
End Sub