wowcoop

Use an online picture host, i use gyazo but imgur will work too. Get the direct URL link, can be got at both of these sites by right clicking the picture and select copy image address from the pop up menu. Return here, click reply, paste your link and then highlight it and click the picture icon (first icon second row) in the menu above the smileys. Type in any accompanying text and then click Post/Preview, if you previewed it and everything looks good then click post.