Help cannot install and work with scripts and plugins

Hello !

I’ve never used any plugins or scripts before, and I’m trying now to install some of them, like the reporter toggler or a script like tunnify. I don’t know if I did the installation in the good way, but now I can see the scripts in the menu, but none of them work, same for the plugin reporter toggler, it seems to be installed because i can see it in the preferences>extensions window but I cannot see it in the panel.
Also, when i try to install modules, there is an error saying “no server with the specified hostname could be found”.
Any advices ?
thanks a lot !