Local only on wireless network

hi, ive been using my wireless network at home for few weeks and then it just said that i have connected to the network but cannot access the internet, local only, i cannot figure out what to do, i have tried turning the power off and on but it still says local only. i can connect via a cable though. can anyone suggest how i can fix this? I am not exactly tech savy, also the only other thing i know may have stoped this is that my stepmother is the adminstrator of the network so im wondering if she has restricted my access to the network, is there a way i can find out if she has? i cannot ask her directly....its an odd relationship so if i did it would cause alot of trouble i dont need. thanks