To post images directly, click on "Upload Attachment" in the area below the "Save" "Preview" "Submit" buttons while you are making the post. Once you have uploaded the attachment, then you will have the option to "Place inline" the image you have uploaded. It's good to use the "Preview" button when doing so, to make sure it turns out the way you want it to before posting.
I added this (totally irrelevant) picture with the instructions I just gave you:
Nauplius.JPG
I hope this helps!
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