I have installed jcow, and installed chatbar module also.

But when I login as admin, and click modules, it says
"App Not Found"

How to enable and use these modules?

I GOT IT!

I was clicking on the link "modules"

Now If I click on the Icon above "Modules" link I can see the list of modules!

Actually this is a Bug Right?

Yes it's a bug. will fix soon.
thanks.