Sorry if this has already been posted but images can be posted by resizing them to 450 pixels wide before uploading to your hosting site, then typing the following into your post:
I've done it as an image so it's nice and clear to see. Obviously the url between the 2 sets of square brackets will depend on your hosting site. I use Imgur and when I copy the BB link the square brackets are already in, pretty handy right now. Good luck.