Instructions for setting up CWOP/APRS data submission by Weather-Display can be found here http://mywebpages.comcast.net/dshelms/wd_aprs_setup.html
Note that in the current version of Weather-Display the Control Panel is a separate item on the task bar instead of an item under Set up.
If you have questions about this FAQ please post them in the Questions Forum http://discourse.weather-watch.com/c/10
Thanks to Dave CWO0351 for permission to link to his site