vincent, after you attach them on the Attachement box, close the box. then move your mouse to your post and click where you want the pictures to be. Then go back to the Attachement icon (paperclip) and click on it. You will see a list of the pictures you have uploaded. click on attach all.
The pictures will appear in your post. At the moment they are not attached yet. That is why they are in links.
Check out this page for more info...
https://forum.petpitcher.net/showthread.php?t=8