How do you post a picture onto this newsgroup?

Actually, it's best that you don't. Not to this newsgroup,
at least. Many some? Mine does! ISPs will automatically
drop posts with binaries that are posted to non-binary
groups. So, for the best chance of being seen, post a
picture on alt.binaries.pictures.orchids or post it on
a website and disseminate the URL here.

To do that (post a picture on a.b.p.o.), it will depend
on the newsreader you use. I know mine has an 'attach'
button to poke at and that will let you attach a picture
to your post.

Tracey