bangbang - when you reply, look below the main text input field below the options section & you will see an "attach file" section - click on browse then enter the locaton ofthe pic on your own local drive & then hit submit.
This is good for a single pic, <100K file size @ 800 x 600
Note: this is not available in the edit function if you didn't include it originally, so you need to create a new reply to this post to access the "attach" function.
If you want to post multiple pics, then use the IMG key above the text input field & enter the URL (address) of the host location where your picture is - you can link multiple pics in the same post this way, but your pics must be hosted on a server, not available from your local pc
Hope this helps - we're all waiting with baited breath ......