Re: online or WiFi
On the top of the screen, toward the right-hand side, there are some icons you can click that cause menus to appear. One of those is the Network Manager, and it detects wifi networks and displays their names. You can click on the wifi network you want to connect to, and then use Firefox to surf the web.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.