Hi Isaac, see here for info on making inline images in a forum post: http://moi3d.com/forum/index.php?webtag=MOI&msg=68.118

One quick note - you'll probably generally want to use .jpg images instead of .bmp images, since .jpgs are way way smaller and quicker for people to download. With BMPs, you will use up your allotted space for attachments pretty quickly.

- Michael