If your Mac is already connected to the Internet wirelessly, by default Windows is also set to access the Internet wirelessly, with no setup required.
You can also bridge your virtual machine to Wi-Fi. When operating in this mode, Windows appears on the network as a stand-alone computer with its own IP address and network name.
To bridge the virtual machine to Wi-Fi:
Do one of the following:
Click the Parallels Desktop icon in the menu bar and choose Configure.
If the Parallels Desktop menu bar is visible at the top of the screen, choose Actions > Configure.
Click Hardware and then click Network.
In the Network pane, choose Wi-Fi from the list.
After you perform these steps, Windows is able to connect to the Internet through the Wi-Fi adapter of your Mac.
If you can't configure your virtual machine to function in the Bridged Ethernet mode, consider using Shared Networking.
For information about troubleshooting networking problems, refer to the Parallels knowledge base available on the Parallels website.