First make sure you are logged in as an administrator. If you are logged in and you are the administrator make sure your cookies are set site wide if IIP's index is not being used in your .threads directory.
The cookie path should be set to / if your index is outside of the .threads directory. You can edit your cookie path from the admin section of .threads. It is located in the configure file.
If the above criteria are met you *should* have a link to set up IIP.
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Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.