posting pictures is very easy.
on your new post ( or edit an older post), put your courser where you want the picture to be.
Look at the bottom and click on "upload a file".. this button will ask you to choose a file from your computer to upload into your post.
Find the file you want to post and that's about it...
Thanks for the help G, but there is nothing there that allows me to do it. Two buttons on the bottom say "post reply" and "more options" of which posting a picture is not one of them. Furthermore, I tried dragging a photo into the text box and it highlighted the whole box red with text saying "uploads are not available".