If you ever want to change Wi-Fi-related settings on your device, you typically go into the Wi-Fi section of the Settings app where you can then toggle the feature on or off on demand and/or pick the network you want to connect to.
A new free jailbreak tweak called WiFi Top Toggle by Mohamed Marbouh does a little bit of rearranging in your Settings → Wi-Fi preferences pane, yielding an end result that feels tidier.