Start a New Topic....
Down below the text enter box is a button 'Manage Attachments' click this....
A new window will appear with some file selection boxes....click 'Browse' next to one of the boxes.....then select your photo click ok...
If you have more than one, click 'Browse' next to the next empty box and repeat....
Then lower down in this new window is the 'UPLOAD' button, click this and wait a short while...your attachments will be uploaded..... you can then close this window....
Then submit the forum post....
Hope that makes it as clear as mud...!!