Fine offset HP2550 Operation Manual page 45

Set Station ID: Press to highlight the Station ID. Enter your station ID.
Press to display the keyboard. Press to scroll to the
character and press to select the character. Press to return to the
setup page.
Set Station Key: Press to highlight the station key. Enter your password
obtained from according weather server. Press to display the keyboard.
Press to scroll to the character and press to select
the character. Press to return to the setup page.
3)Viewing data on wunderground.com
The most basic way to observe your weather station's data is by using the
wunderground.com web site. You will use a URL like this one, where your
station ID replaces the text "STATIONID":
http://www.wunderground.com/personal-weather-station/dashboard?ID=ST
ATIONID
It will show a page such as this, where you can look at today's data and
historical data as well:
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