Google Nexus 7 can be connected to WiFi network using the options available as part of WiFi settings.
Step 1: Pull down the top settings bar on Google Nexus 7
This would display the Settings option as shown below.
Step 2: Tap the Wi-Fi settings then turn on the Switch.
This would display the list of available Wi-Fi networks
Step 3: Now the tap the WiFi network to which you want to connect the Google Nexus 7 device.
Step 4: If the Wi-Fi network is password protected then you will be prompted to enter the password.
Step 5: After entering the password, tap the Connect button.