You could do any of the following:
1. Post a link where we can see it,
2. use [img] tags,
3. click on the icon with a picture of the sun behind mountains, next to the hyperlink icon (this is the same thing as using [img] tags but saves you the trouble of having to type them out), or
4. click on where it says "Attachments" below the three buttons:
You do not have the required permissions to view the files attached to this post.