Connect though Work Network

Good day,

I am running Thunderbird 3b1 from a USB stick at work. I can't convince it to connect to the network. I'm guessing I need to set up the proxy settings in the connections menu but I don't know how to either find those settings or set one up. I've been searching for some useful information for days but its all been very sketchy.

I can't just ask my IT dept for the settings.

Thanks,
Levi