Hallo everyone. I didnt found a threat like this so i created new. I got my new internet modem with wi-fi router inside. I connect my laptop throw wi-fi and pick a WPA-PSK password. My neighbor asked me to give my wpa psk password to check his own modem with wi-fi ( he has no internet plan). I was helpfull and gave it (good neighbor ;D). But now he is using it almost like his own(bad neighbor ;D). So can someone help me? I want to change my password. Thanks 
