Sounds like your wifi is not connected then. When it is connected you should see it with 2 IPs one for cable and one for wifi. If you only see the cable one, go to global settings->Network and select your wifi, wnter new password, save and connect. You should see at main tab of network that you are connected to wifi now. If not something went wrong, Only once that is working you can disconnect.
If there is an old network visible that has changed password also delete connection in same place so it is not selected for connection and will then fail. Server assumes all visible known connections are as good and selects first in internal list.
