Welcome to Adobe Forum,
You can try to find the answer here :
http://blogs.adobe.com/lightroomjournal/2013/05/lightroom-and-the-creative-cloud.html
http://blogs.adobe.com/creativecloud/lightroom-5-is-now-available-on-creative-cloud/
http://lightroomkillertips.com/?p=5102
I am reposting one query of the last link:
Q. How do I get Lightroom if I join the Creative Cloud?
A. It’s easy. It shows up under your “Apps” tab when you install the Creative Cloud Updater/App Manager.
In case the issue is not resolved, please contact Adobe at
Regards,
Rajshree