Can't find Airport Setup Assistant!

I just received an Airport Express Base Station from a marketplace trade, but it didn't come with the CD (which we agreed upon).

I am unable to locate the Airport Setup Assistant in Applications/Utilities, or anywhere else. I've tried spotlight.

What are my options? I've searched on my restore disks that came with my MacBook, nothing. I can't find it on my iMac either.

 

Nevermind. I just had to reset the router. Working great now.