Click "go advanced" for your post. On the upper menu that appears, look for the paperclip icon with tiny down arrow next to it. Click on that arrow and a 'manage attachments' window pops up. You can browse to your photo location, add 4 photos very easily, and click 'upload'. Close popup window when done. Next time you click on the paperclip, your photos are clipped there and ready for you to click on them to insert them in the message.
To every thing there is a season, and a time to every purpose under the heaven... --Ecclesiastes 3