How to start Air Mirror ?

This seems a bit stupid, I'm sorry, but I cannot start AirMirror.
I installed the windows 3.3 version of airdroid, for a Wiko with Kitkat.
Connection is OK, with the windows application or the web one.
explanations For Win Client:
Click the AirMirror icon:
BUT I don't see the icon for airmirror,
I tried to connect thru an USB cable, Windows file explorer see the files.

What did I miss ? can't find any idea ... Then, please...

@hubert You can find AirMirror icon here: Check this guide for more information about AirMirror: http://forums.airdroid.com/viewtopic.php?f=4&t=15843&p=41902#p41902

thanks a lot... so easy (when you know...)