How to Stream on HBOlympia using OBS...

Set up a Scene, you can name it Helbreath.
Set up a Source as Display Capture.
Right click on Display Capture source, and select "Edit Transform."

Positional Alignment -           Top Left
Bounding Box Type -             Scale to height of bounds
Alignment in Bounding Box -  Center

That's it, start streaming. 
This information found by me through extensive trial and error & shared with others to help increase the publics awareness of this games existence.. Bring it to the masses with streaming! :)