Hi,
You will need to register for a station ID at the upload services, CWOP, WU, WOW
Then from your Weatherlink.com bulletin page, click Share and Uploads (upper right) > Upload > Add Upload or Manage Upload, and select the service(s) you want to upload to. Enter your station ID, etc. With a basic Weatherlink account you can select 15 minute update, and with a Pro account you can select down to 5 minute update.
Enjoy,
Paul