"a friend surgested it needs a reset? dont know what that means?"
It's possible it just needs a rest. Unplug the power supply cable - wait for 1 minute then plug it in again. It will take some time to reboot - a minute or two.
There will also be a reset button at the rear - possible inside a small hole. Pressing that reset button may change settings inside it (and be very careful what you poke in the hole - a toothpick may be OK).
Of course if the wi-fi isn't working, it may be at your computer end or the modem/router end. If your computer is a laptop, be sure you haven't accidentally switched it in the laptop - many of them have an easily pressed switch.