You need to make frmnumber's lblannounce.Caption independent from the Form Load event. One way would be to set the label's Caption in frnannounce.
frmannounce:
Code:
Private Sub cmdsend_Click()
frmnumber.lblannounce.Caption = "You can check the status of your document online with your tracking number  Icon...     " & Text1.Text & "... "
frmnumber.Show
Unload Me
End Sub
and remove
Code:
    lblannounce.Caption = "You can check the status of your document online with your tracking number  Icon...     " & frmannounce.Text1.Text & "... "
from frnnumber's Load event