If you're talking about the toolkit that you buy, it should be in the bottom right of the functions palette.
If you're not finding it there, perhaps it's not installed properly, or it's not in the right spot on your hard drive.
The default directory (and consequently the directory that LabVIEW looks for it in) is
C:\Program Files\National Instruments\LabVIEW 7.1\vi.lib\addons\database
Try checking there, and if they're not in there, do a search of your HD for something like "connection.llb"