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I can barely read the black text with a gray background that my Gimp is using.

How can I change that?

Thanks.

I can not figure how to attach an image? 

https://imgur.com/a/10B6WkT

Edit > Preferences > Interface > Themes
Try some out and see if they are better for you

Thanks for the screenshot in action this did allow me to find out what's going on.

It's because you are trying to write a text outside of the image / canvas,
You can increase the canvas size by going to the menu Image ➤ Canvas size or write inside the canvas/image, then move your text and eventually go to Image ➤ Fit Canvas to Layers to see your text.

10 seconds video https://imgur.com/a/FQWW8LN

[attachment=8622]

As PixLab indicated, the text layer is outside the canvas. 

You can see what is there using the toggle View -> Show All The background changes to a checker pattern. Then decide to move the text or increase the canvas size.

[attachment=8626]