Second Hand Computer Desks Just Bought Second Hand Lap Top?

Just bought second hand lap top? - second hand computer desks

I know very little about computers, if someone could help.Although I have a desktop that I use laptop in another room is a Packard Bell. First, how can I configure it for internet, I've tried, but I can not internet. I have (a small box that says online (running), the modem is in use) and telephone (not used), but it works as advertised in my desktop.I also bought a wireless adapter, but I think it is any question that is later covered represent too complicated.