Simply click on the fire place ground. The menu will show you different options.
RL Mode:
In order to keep the fire alive you will have to add wood manually. When the fire tells you to add wood, just click on the fire place ground for a menu and then "Add Wood!". If you don't add wood, the fire will die after some time.
SL Mode:
The fire burns without any need of adding wood.
To reset the fire, just choose "Reset" from the menu.
This fireplace is perfect for every beach and it's lots of fun to hang out with friends next to the fire and add wood time to time. It's a real running gag!

Preview pic:
http://homepage.mac.com/ludvaig/PhotoAlbum41.html
SLURL:
http://slurl.com/secondlife/Lindman%20Design%20Beach/44/196/22