Try the following
Code:
Sub UpdateMyTips()
Dim myNewTip As Long
Dim myOldTotal As Long
myNewTip = CLng(ActiveDocument.Paragraphs(1).Range.Words(1).text)
myOldTotal = CLng(ActiveDocument.Paragraphs(2).Range.Words(1).text)
With ActiveDocument.Paragraphs(2).Range
.Words(1).text = CStr(myNewTip + myOldTotal) & " "
.InsertAfter text:=myNewTip & " " & Format(Now(), "DDDD, MMMM d, yyyy") & vbCrLf
End With
ActiveDocument.Paragraphs(1).Range.text = " " & vbCrLf
End Sub