Adding an image is fairly straightforward, but it's important to check a few things:
To add an image to a forum post, book, or page, click the image icon in the editor toolbar (looks like mountain scenery) and click Find or upload an image. Then browse for the image and upload it.
ALWAYS give the image a description (accessibility requirement).
In the Appearance tab you can (crudely) resize the image by specifying a pixel size.
For more see guidance on using images.
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