Configuration of your WiFi card:
First off all be sure to meet all the requirements to use the service.

When you are in a Wireless4Free HotSpot and you are in the signal range, open your laptop and select W4F in the list of available wifi connections.

Usually you can find this option in the wifi card properties under the name Network or SSID. (for more informations please check that your wifi card is supported by Wireless4Free).

It is very important that your pc is configured to work with DHCP (automatic ip address assignment).Check this in your wifi card properties menu.