in the reply box i'm typing in right now m8, right above it, there's a bunch of symbols and what not.. if you come in from the right hand side, the last one looks kinda like a ballon that would be used in a comic strip, the next one a film strip, and the third one, i have no clue what it looks like, lol, but that's the one you want.. click on that, and when you do, a new window will pop up.. it'll say something like from url or from your computer, click your computer, then another thing will pop up, and click on choose file, and this will take you to your computers gallery, or w/e it's called.. choose the pix you want to upload, i think you can do like 5 or so at one time, one at a time.. when you're done, click the upload now box under the chose file boxes, you'll see it.. this will insert the pix in the reply box for you.
when you're al done, hit post quick reply and they should all be in the post for you..
let me know if you need anymore help..