[Trisquel-users] Re : 13Aug2017 buy Trisquel laptop

[lcerf]

When the Ethernet cable is not plugged, there should be a Wifi icon on the  
panel, isn't there?  Click on it to select the network you want to connect  
to.

Read https://trisquel.info/en/wiki/add-and-remove-programs about  
installing/removing/updating packages.  More generally, here is a list of  
manuals: https://trisquel.info/en/wiki/all-manuals