After testing the configuration of step 2 by the gear net software on my PC (because I was in WEP for WIFI on my livebox advisable to use this config), but everything is well paramétrait arrived in step connection to the box (last stop), systematic crash!
So I decided to change the config of my box by replacing WEP setting WPA. So I was able to check the activation of the WSP livebox interface.
The biggest job is done, I apply the new settings to my Livebox and I plug the amplifier, I support the Push button e WSP miracle and there it connects directly using the same encryption that my Livebox.
It still took me one and a half to understand H how.
But after nickel, there is choose the network "livebox12121_ext" and enter the security key on each device and voila.
My house is 30 m long. My Livebox is at the end of my house, the amplifier is connected to the 3/4 and I capture in my garden.
So I recommend for novices but it seems complicated to me anyway ... is better to know a little computer unless your box is already configured.