Hello Giulio,
Sorry for late reply to this,
I have tried to type something in your reply section, it seems like i'm no facing you mentioned that issues written very slowly, check my video :
http://screencast.com/t/LyzFhjpl
Regarding with your second issues ( can you help also for signature,..i've setter a signature but is not showing !! ):
>> You have to enable the setting from your backend > Easydiscuss > ACL > select your user group > Display signature - YES ->
http://screencast.com/t/NTLDrFLiOuvT
Hope this help.