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. A popup window will appear that provides all the information you need in order to stream via Facebook,
Just copy the URL from the “Server or stream URL” field! Merge both 'server url' and 'stream key' in a single address and fill this info under 'Facebook media URL'