It is a simple as that I installed glimpse following this page. :
http://getglimpse.com/About/QuickStart
I then attempt to navigate to http://myApp/glimpse
http://myApp/glimpse
In my case, the web app is not deployed in root, so the url is:
http://localhost:54026/MyApp/glimpse.axd
Very obvious, but I'll leave this answer as a reminder.