Get going live on Facebook with this straightforward tutorial. If you need Wirecast software, check that out here.
How to stream from your desktop to Facebook Live using Wirecast or OBS
From Trey Ratcliff
This is how I broadcast live on http://facebook.com/treyratcliff using Facebook Live and Wirecast or OBS. EDIT - I may have a solution why OBS did not work. You need to have Flash enabled and I think it is off by default in Chrome.