Posting a picture- do not use the "quick reply" at the bottom of the screen- hit the reply button at the bottom of the post you're wishing to respond to.
When the text box pops up for you to write your response, notice on the bottom left side, you'll see "Options", then "Thread Subscription", then underneath that, "Attach files". Click on the "Manage Attachments" option to the right of the "Attach Files". When you click on "Manage Attachments", you'll see a "Browse" button. Click on that to get to the file or picture you want to put in your post. Be sure that the file extension is one of the following, or it won't be added to the post: bmp doc gif jpe jpeg jpg pdf png psd txt zip. I also think whichever file you add must be less than 100kb, or it will not attach either. Finally, when you've selected your file, then click the button called "Add this File". You'll see the hourglass on the screen, and as soon as it disappears, click on the "All done". Finally, you'll be back to your original post, and you just need to hit the "submit reply" button, and you'll see your picture or whichever attachment you've put up there.
PM me if you have any additional problems or questions.