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You will need to get the SSID and enter it manually. Here are instructions from Microsoft:
1. Gather the following info:
Network ID (SSID), which is the name that would typically appear in the list of available networks
Type of security (WPA, WPA2, WEP, or 802.1X)
Type of encryption
2. Connect to a network by swiping in from the right edge of the screen, tapping Settings (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Settings), and then tapping or clicking the network icon. Tap or click the network you want to connect to, and then tap or click Connect.
3. Tap or click Hidden network, tap or click Connect, and then enter the network info.