How do i get my wifi internet back

Factory reset, erases everything on the tablet including user data as well as any WiFi passwords that may of been used for network security. Simply refer to your settings- turn on the wifi - connect to preferred network and input your original password. By default this password will be saved for future sessions.

It sounds as if you simply need to reconnect to your wifi network. If you have already connected to it, but still have no access, then disconnect from your network, remove the network from your settings (Forget The Network) and then try reconnecting to it.