1 - Select and copy this URL:

http://127.0.0.1:2400/AdKiller.pac

2 - Select 'Preferences...' from the 'Edit' menu.

3 - Go the Proxies category in the Advanced section.

4 - Select 'Automatic proxy configuration'.

5 - Paste the URL into the 'Configuration location (URL):' box.

Click OK to dismiss the window, and the setup is complete.