Its fairly easy if you go to the bottom of your new post and click on "new attachment" then just choose your picture and follow the directions.
But its even easier if you open a free photobucket account or put your pictures in tinypic.com first, then you just copy/paste the code.[hr]
"add attachment"
select which picture you want and click 'open.'
'insert into post'[attach]25542[/attach]
'post reply'
[hr]
I did the above two different ways. But I find it much easier to use photobucket.