I am using the following code to save a file using a value in a cell.

Please help and provide detailed answer as I am new with VB.

This is what I want to achieve:

1) If cell is empty, prompt the user to enter their LoginName
2) Even if the cell is filled, ask the user if that is the correct LoginName
- perhaps by showing the LoginName, but I don't know how to do this!
3) save the file using value in a cell - I would like to save it to a
specific folder, but again don't know how to.

The problems I'm having a

1) I am getting the message and prompt "Have you entered correct LoginName?"
twice
2) Something is wrong with this part of the code: ActiveWorkbook.SaveAs
Sheets("Jan").Range("Y23").Value & ".xls"
3) When the Excel Prompt comes with "File already exists do you want to
replace it" and the user clicks no another prompt says "visual basic error
400"

Please help and provide detailed answer as I am new with VB.

Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
Dim Msg, Style, Title, Help, Ctxt, Response, MyString
If Me.Sheets(1).Range("$T$23").Value = "" Then
Beep
MsgBox "You have not entered your LoginName on the first sheet - Jan!"
Let Cancel = True
Exit Sub
End If
Msg = "Have you entered correct LoginName?"
Style = vbYesNo
Title = "Save Prompt"
Response = MsgBox(Msg, Style, Title)
If Response = vbYes Then
ActiveWorkbook.SaveAs Sheets("Jan").Range("Y23").Value & ".xls"
Exit Sub
Else
Cancel = True
End If
End Sub