First connect to the right wifi network, then run ./wifi-login2.py to automatically log in.
The script will only fire off the "accept" HTTP request if your internet access is being intercepted (e.g. by an "accept these terms" page) and you're on a recognized wifi network.
To add a wifi network, connect and perform the action necessary to log in while capturing the HTTP request. Put a text file containing the request into http-login/, with the name [SSID].txt, replacing [SSID] with the SSID of the network.
On a Linux OS using NetworkManager, run ./install.sh to add an entry to /etc/NetworkManager/dispatcher.d/ so that it will try to log you in automatically when your wifi connects.