You access an ISearchServer object by calling the SearchAdmin.SearchServer property, as in the following example, where objSearchServer is the name you give to the new ISearchServer object:
Option Explicit
On Error Resume Next
Dim objSearchAdmin, objSearchServer
Set objSearchAdmin = CreateObject("Search.SearchAdmin.1")
Set objSearchServer = objSearchAdmin.SearchServer
...
'Release objects
Set objSearchServer = Nothing
Set objSearchAdmin = Nothing