To use this plugin, you will need to have an AWS account.
1) Open the Interactive Video Service landing page

2) Click "Create Channel", in the top right

3) Give your channel a name.  You can keep the rest of the options default for your first channel, or you can modify settings as you wish.

4) Open a streaming application.  OBS Studio, which is cross-platform and free, is the tool suggested in Amazon's documentation, and works great.  The next steps will assume you are using OBS Studio, but you can adapt these steps to other tools.  The important thing is that the streaming app supports RTMPS.

5) If you've never used OBS Studio before, complete the set-up wizard; it takes only a minute or two.  Select "optimize for streaming".  When you reach the screen asking for a server, click the drop-down and select "Custom Server".  It asks for 2 fields: Server and Stream Key.  These two values are on your newly-created channel page in AWS IVS.

The Server value is listed under "Ingest Server" and looks something like this:
rtmps://a255e632v689.global-contribute.live-video.net:443/app/

The Stream Key is hidden by default, so it looks like a string of dots.  You can copy it to your clipboard without revealing it, or you can click 'show' if you want to view it.

Copy and Paste these two values into the OBS Setup Window.

6) In OBS Studio, add a "source", such as screen capture or webcam.  This is what you will stream to your IVS server.

7) Click Start Streaming, and test that whatever you selected for your video feed (screen capture, video file, webcam, etc.) is coming through to IVS.  You can see this in the Live Stream tab of the IVS page.

8) If the video is being passed through, you can view it in bubble.

9) Install this plugin - Video LiveStream - AWS IVS.

10) Place an "IVS Stream" element on your page.

11) Fill the stream_url parameter with the "Playback URL" value near the bottom of your IVS channel's page.

12) You're done!  Check out your new live stream in Bubble!