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I'm using Blender for editing desktop recordings that I make using Open Broadcaster software.

I would like to highlight areas of the screen to draw attention to them by surrounding them with a red rectangular box.

I've created a previous post that asks: How to highlight areas of a desktop recording in video sequence editor

The answer to that post is fantastic, and I would like to now understand how to create an image in the UV editor for using as the mask. How can I do this?

I'm a complete Blender noob and have not used any part of Blender except for the VSE.

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What you want to do is split a screen and open a UV/Image Editor, or just open one up through the bottom, lefthand icon:

enter image description here

Load in an image with the Open button (you can screenshot a frame of your video) so that you know where to put your mask.

enter image description here

Still in the footer of the UV/Image Editor, add switch from View mode to Mask mode.

enter image description here --> enter image description here

Add a new mask:

enter image description here

Now there are three keys to remember:

  1. Ctrl + LMB LMB adds a Control Point where you click.
  2. Once you have three or more points, use A to select all/deselect all.
  3. If every point is selected (yellow), use Alt + C to connect the points.
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