Wireless Internet Connection problem. I have a signal but doesn't work

I know this question is rather abstract but I have a laptop that connects to the internet wirelessly but recently one of my cousins come over and tryed to get it to connect to the internet through a cable. He ended up skrewing it up and now it won’t connect wirelessly. It finds the signal and everything and even shows that it is sending and recieving packets but I can’t use the internet for some reason. Any ideas what I’m doing wrong?

I can post screenshots of the network connections properties if that will help. TIA