ok after you've clicked on the paperclip, (which doesnt show up in quick reply, in that case you would have to go to "advanced") a box will appear.... from their you will choose browse, since you said you have the pic uploaded on your computer... you will then browse its location through that link and when you have it click upload, it allows you to upload 1-4 at a time.... then it'll say "loading please wait"or something like that, when its done, close that box and submit your post, (I do the attatchement part last) then if working and dont right it'll show up in your post.
this help?