I'll try...........
Download the photo's into your pc.
Resize them in your photo software programme. (They need to be quite small, but I can't remember the exact size. I make mine abour 40% of their original size) I always save them as 'something - tas' makes them easier to find
Post your reply (if it's a long one right click and 'copy' the text before you try adding photo's that way if the photo's are too big and you hvae to do it again, you don't need to retype it all)
At the bottom of the text box there's an 'additional options' bit, click that and it brings up the option to add photo's.
Select them and hit post - fingers crossed, if your photo's are the right size it should be fine. If not you need to go back and resize them a bit smaller again and repeat the whole process
(hence, why it's handy to have the text all ready to paste)
Alternatively, you can set up a 'flickr' account, post your photo's on there without having to resize them and just post a link to the photo in your reply instead.
HTH
Karen x