MsgBox function in VBA displays a message in a window and waits for click on a button.
Example of using Yes-No Message Box:
Sub MessageBoxExample()
Dim iRet As Integer
Dim strPrompt As String
Dim strTitle As String
' Promt
strPrompt = "Ask Your Question Here, OK?"
' Dialog's Title
strTitle = "My Tite"
'Display MessageBox
iRet = MsgBox(strPrompt, vbYesNo, strTitle)
' Check pressed button
If iRet = vbNo Then
MsgBox "NO!"
Else
MsgBox "Yes!"
End If
End Sub