In order to stream with Facebook using StreamElements, first of all make sure you have a Gaming page and Admin access to it. You can refer to this article from Facebook for instructions.
Once you have the gaming page ready, navigate to https://streamelements.com/ and login with your FB account. Select the proper page, make sure to allow all requested permissions, and press 'Done', then 'Ok'.
You should then be redirected to your newly created StreamElements FB account, and see the StreamElements integration in your Business Integrations page.
For initial setup, create an overlay and save it with a name of your choice (you can add a widget or an alertbox for visual indication and testing) then create a browser source as shown here. Proceed to link your Pay Pal account in the tipping settings page for the tipping link to be generated.
You can refer to the General category of the Knowledge Base to better understand how the dashboard works. Please note that not all tools that are available on Twitch or YouTube are available on Facebook, due to different API restrictions.
In SE.Live, navigate to the StreamElements menu in the top bar > Login.
Enter your account credentials, choose the page, allow all permissions and immediately upon logging in you should see the activity feed dock popping up on the left, and the chat dock on the right, asking you to "Start streaming to activate chat".
There are two ways to start streaming on Facebook via SE.Live
Create a new Facebook Live Video post with these settings
This easier option will result in you immediately starting to stream on your gaming page with the title, description and game you choose to set in that window.
1. Press 
2. This window will pop up -
Set it up as you wish and press 'Go Live!'
Your Stream Key will be automatically populated in Settings > Stream.
The Service will be changed the 'Custom' and there will also be a server address.
The broadcast itself will show on your page, under the 'Live' tab.
You can also set it up manually.
After logging in, press the "Streamer Dashboard" button in your chat dock.
This will open a new browser window showing the 'Live Dashboard' page.
1. Press 
2. In the 'Get Started' section of the Live Producer, select
3. In SE.Live, press Settings > Stream
4. Select 'Custom' as the service, and copy the Server URL and Stream Key from the Live Producer page, press Ok to accept
5. Press
6. Choose "Go Live with Facebook Streamer Dashboard settings"
At this stage, you should see the indication in OBS for streaming, but you're still not live in your FBGG page. Navigate back to the Live Producer (where you got the server URL and stream key) and scroll up to see the feed from your OBS in your Live Producer.
Since the settings are provided on FB this time, rather than within SE.Live, make sure to set everything up on the left side of the Live Producer - Choose where to post (timeline \ pages you manage\ groups), title, description (required) and game tag (under 'Gaming').
When you're ready, press 
And check your gaming page for the post about your live broadcast!
NOTE: The chat window will only show in OBS as the dock once we can locate the video post on your page. So if you're using the first option to go live, the chat dock should become available pretty quickly. If choosing the second option though, the chat dock will not be available until you go live in your Live Producer.