Welcome to the Forum.
Could you check, please, if your wifi connection is turned on?
> settings>Wifi> Wifi networking on.
Iam facing the same issue. I got lumia 510 last week and never got wifi working properly. Probably this is gonna be my last nokia phone.
i too have the same problem... bought the phone only 4 days ago.. it dosent connect to wifi properly.. gets disconnected every 2-3 mins and then reconnects... please fix the issue!
Try restarting your phone: Just press and hold the Power button until you see Slide down to power off, then flick down. After it's off, press the Power button again to turn on your phone. To isolate the issue, try other Wi-Fi connection and see what's the outcome.