Inserting an image
Tested with Firefox 87 on Win10
There are several ways to insert an image and Robin's old post is now obsolete.
Before starting, make sure that the images that you upload are not too big; there are still people in this world that don't have fast internet or unlimited bandwidth; 200 kB or so sounds acceptable in my opinion.
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You can simply drag and drop and image file from your PC into the editor window of the forum. The result in the editor window looks like
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You can also click the upload button
in the toolbar in the editor window of the forum and follow the instructions; the result will be the same as the above. -
A neat feature of the new forum is that you can dump a screenshot of (a part of) your screen in the editor window; please take size into account ! In Windows, I use the snipping tool and the image of the upload button under (2) was placed that way by selecting the button in the snipping tool, copy it using < ctrl >C and next paste it in the editor window < ctrl >V.
The below image often reflects my state of mind 
