1. Download the latest version of dynmap from here http://forums.bukkit.org/threads/489 (click 'Download Latest' at the top under 'Quick Links:'
2. Upload the content of the zip (dynmap.jar and the folder dynmap) to the plugins directory in File Manager
3. Click the dynmap folder inside plugins
4. Click the drop down box next to configuration.txt and choose edit
5. Edit the following section as below
# The path where the tile-files are placed.
tilespath: web/tiles
# The path where the web-files are located.
webpath: web
# The network-interface the webserver will bind to (0.0.0.0 for all interfaces, 127.0.0.1 for only local access).
webserver-bindaddress: 0.0.0.0
# The TCP-port the webserver will listen on.
webserver-port: Between 4-6 random numbers
Make sure you set IP to: 0.0.0.0 and PORT to: Between 4-6 random numbers.
This is to make sure the port is free and not firewalled, using ports other than this could lead to a port conflict and your server being disabled.
6. Restart the Minecraft server then connect and place a few blocks
7. Open up your web browser (e.g. Internet Explorer, Chrome, Firefox) and navigate to http://IP:port e.g. http://213.124.24.187:8473
You should see a page which says "Minecraft Dynamic Map" and some images of your world.
NOTE: This assumes your server is using the default world name "world", if you have changed this you will need to edit the dynmap configuration.txt accordingly.
