Sorry I didn't notice this post. When I replied to it, there is a button on mine that says 'upload a file'. Just click that and then click choose file on the thing that pops up.
Type your post, make sure the cursor is where you
want the picture (below the post or above it)
The picture will be placed where the cursor is active
at the time you select post!
After you typed your post, select Upload a File
A popup box will open, select the place where your picture is at and click on the picture then select open
Once you selected your picture and it's been uploaded choose Thumbnail or Full Image
Then select Post Reply
If it all worked, it should look like this post, hope I didn't confuse things here?