How To Post Photos
After signing up for an account, go to your "Camera Roll" page (circled in red). This is what the page will look like (minus my photos, of course).
Once on your Camera Roll page, you can drag and drop photos directly from your computer to the page. Open your picture file, grab your picture and drag it over this page. You'll see a message that says, "Let go! We'll take it from here." Release the photo. In the upper right of the screen (circled in red), you'll see "1 new photo has been uploaded."
Click on "Photostream" (circled in purple, on the left of the screen, just above the pictures).
Here's your new photo. Click on it.
The top of the page will look like this. Note the little arrow on the lower right, circled in red. We'll come back to that in a minute.
Scroll down a bit and you'll see the bottom half of the page. To share a photo on a message board, the privacy setting on the photo must be changed from "private" to "public" (circled in red). Change the setting of your photo to "public".
Scroll back up and click on that little arrow. You'll see this box. The "embed" code will be highlighted. Copy that code and paste it into your post on the message board. You'll see the code, but you won't see the picture until you post the message.