The only info I can help you with on this one is instructions on posting photos:
Your image must be less than 500 kB. In fact the total of all attachments must be less than 500kB, so you may have to reduce a high resolution photo even if you simply open it in Microsoft's Paint and resize it to 10-30% and resave it. (That program will show the file size after you resize it ONLY after you resave it).
Choose the "More Reply options" button on the bottom of the post you are composing, click the "Browse..." button under attach files, select your file, and choose "Attach this file". It will then appear with your post.
If you want it to appear in a specific place within the text of your post, insert your cursor there, and click the "Add to post" button to the right of the file thumbnail.
You can always see how the post will apper by by clicking "Preview Post" at the bottom of your screen before actually posting to verify.