Open the picture and look towards the right where all the photo information is stored. Underneath that, you'll see "share" and there's a box with a code in it. Copy and paste that code into a post on here and the picture will show up :)
When you are on one of your pictures, on the right side of the screen under all of the picture info, you'll see the share boxes. There is one box that has the actual picture link in it. You need to copy that link then paste it right into the text box here. It will show the actual picture itself once you hit the reply button. I think you can also tag your picture critique-me and there is a section of pictures where people as for critiquing ;) Hope that helps!