1. First, login to your Facebook Page and select 'Publishing Tools' in the top navigation bar.

2. Select the 'video library' option from the left-hand menu, then click on the '+Live' button located on the top right corner.

3. The next page will provide all the information you need in order to stream via Facebook, 

If you have upgraded to Facebook's "Live Producer", this is the window you will see:

Copy and merge both the "Server URL" and the "Stream Key" in a single address and fill this info under "Facebook media URL"

4. After a while the option to "Go Live" will become available on the bottom left (Live Producer)