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You can, for example, upload from Flickr. This has options for BB Code, and for various sizes. If you wish, before you post, you can edit out the details of your Flickr account. You can also choose sizes; I usually go for 800 pixels—I'm guessing, but many people might view on a laptop, where anything much larger needs a lot of scrolling.John
Something around 800-1000 pixels on the long side is good. Normally people upload from a web source that allows BBCode attachments which show the full sized image, however, if this facility is not available to you, just upload from your desktop and the thumbnails will enlarge when clicked on.
Hope this helps