Well since we are all putting our two cents in here and I don't think any of it clear. Let's add one more:
From the RPOL Help info
How do I...
Put pictures in a post?
Images can be inserted into posts using the Image tag, <img>. In order for an image to be posted in a game thread, it must be hosted somewhere online. Where it is hosted is known as its address, or its URL.
To insert an image into a post, use the Image tag with the image's online address to tell viewers' browsers where to find the image:
It's important to only link images which you host on your own webspace somewhere. Displaying images that others are hosting is known as Bandwidth theft, and is a big no-no.
Finally, images can only be posted in games, not in public forums.