This feature isn't available in the legacy free edition of Google Apps.
To manage a calendar resource (such as a meeting room) for your organization, you need to first add the resource to your My calendars list.
To add a resource to your 'My calendars' list:
- As an administrator, access your calendar.
- Click the down arrow by Other calendars and then select Browse Interesting Calendars.
- Click the More tab.
- Click Resources for <your domain>.
- Find the resource you want to add and click Subscribe.
Because you're an administrator, the resource will now appear on your My calendars list. If users follow these steps, the resource appears in their Other calendars list, where they can view the resource but not edit or manage it.
Once you've added the resource to your My Calendars list, you can use the drop-down menu by the resource to share the resource, get notifications about the resource, or modify the resource's settings.