Sorry if this is a stupid question, but: when writing posts, how do I attach a picture to a post? I'm not asking how I attach an image that's already on the web - I've already done that many times since I joined. I want to know how I can share a picture I have on my laptop which I haven't uploaded. I can't find any option (when I click on "Attachments and other options", all I get is some options about replies, smileys & return to topic).
Thanks a lot!