Note: This tutorial is for One Button Studio+Plus version 2 users.
The version 2 control panel looks like this:

Step 1: Download the OBS+Plus v2 Demo video file here: https://drive.google.com/file/d/1rte3pLQ21lcUyHTOrQAYVsIvUqup5ISF/view?usp=sharing

Step 2: Follow the instructions in this video.