Ok I've been having issues with this. I bought an ethernet/usb adapter from Apple today because the Macbook Air doesn't have an ethernet port. Now after I plugged everything in, what do I have to do? I should add that I am connected to the school's wifi on my Mac so thats not an issue. I've googled and everything and I've tried sharing the network but it doesn't follow what I'm seeing. I would really appreciate help if you can give any. I've had issues with this for a while now!