Configuring the Landscape directory in NWDS

Hi,

We are using SAP NWDS 7.3 SP09 and according to it's help for configuring NWDS to connect to the SLD that contains NWDI landscape information, we are to:

Choose WindowPreferences Development Infrastructure LandscapeDirectory.

However after clicking on Window->Preference we have no 'Development Infrastructure' option available to us.

Can anyone shed any light on this please?

We are completely new to NWDI & NWDS so forgive us for missing something glaringly obvious !!!!