One way is to click on Community photo's a at the top of the page, in between News and FAQ. Upload your pictures on that site. Once the pictures are submitted and uploaded, right click on a picture you want to add and select "properties" in the drop down. Copy the URL in the properties screen. On your post, click on the picture icon and paste the URL in the box. Should work. I had trouble with this when I first started as well. My pictures kept disappearing or not showing up at all.