Can WiFi be added to my iPhone?

The WiFi setting on your iPhone, is excess able in two different locations. The first location that I would setup the connection through, is in your devices settings app, labeled as Wi-Fi. After you have clicked the Wi-Fi, you will need to turn on the Wi-Fi capabilities, then look for your Wi-Fi service name, and enter the password to connect. This will save the information, allowing you not to worry about entering your Wi-Fi account information.

The second place that you will be able to turn on or turn off your Wi-Fi, is by pulling down on the top right side of your iPhone. Several widgets will be on this screen. In the upper right hand corner the widget with four different symbols located on it, is where you will find the symbol for Wi-Fi. You should be able to simply tap on the icon to either turn off or turn on your Wi-Fi from this location.

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What do you mean can you add it?

All iphones have a WiFi radio built in.