To post a photo, when you reply click the Photo icon in the lower left.
Then you'll get a popup window with a Add Files button. Click that. Select the photos you want to upload. Check the "Certify right checkbox."
You can add a title and description of the photo if you like.
Click Start upload. Once it's finished you'll see an "Embed" button which let's you embed the newly uploaded photo right into the post, like this:
There's a little awkwardness. After you click embed, you have to click "close" to see your photo embedded.
On my todo list is to make this process a bit easier.
Thanks for joining us on the site! If you have any questions or suggestions or run into anything that's not working, please let me know.