Paste direct link to the image inside img tags.
He cant do it, afaik new is not able to add an image on his post in this forum. He need to wait till he is upgraded to higher rank to post an image, what he can do know is just post the link directly then other member can quote it to show the image. Correct me if I'm wrong
Indeed, you need to be a junior member to post embedded images.
Refer to https://bitcointalksearch.org/topic/images-in-posts-disabled-for-newbies-1172918.
You are also correct saying that if a higher ranked member quotes his message, the image will show up.