either click the "go advanced" button use the "attach image" button (below where it allows you to choose the font size) and paste the link of the image. you can also click "the manage attachments button to upload an image that is saved to your computer.
There's no such thing; there never was. Where I am going you cannot follow me now.
use image tags, like so, (Invalid img), if the picture is on your computer, you need to upload it to a image hosting site first.