You have to register for a free Journal account to use the Wi-Fi, available through September. Here’s the Journal’s release:
The Wall Street Journal announced today it is offering free Wi-Fi through September in more than 1,300 hotspots throughout New York City and San Francisco. Labeled “The Wall Street Journal WiFi,” the network is now available in nearly 70% of Manhattan, including many of the city’s most highly trafficked neighborhoods such as Times Square, Union Square, and the West Village, as well as some areas in Brooklyn, Queens, and the Bronx. Washington Square, Nob Hill, and Fisherman’s Wharf are among the neighborhoods in San Francisco where the wireless network is also available.
To access the Journal’s Wi-Fi, new users and print subscribers must register for a free Wall Street Journal account. Current Journal digital subscribers and existing free registered users of WSJ.com can use their existing online log-in credentials to access the network.